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Free Kindle eBooks | Hard Science Fiction | from Amazon and Smashwords

Showing Free eBook 1-30 of 156
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Rating: 4.50 / 5
31 reviews

The 28th Gate: Volume 1

by Christopher C. Dimond

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Genre: Fiction, Action & Adventure, Science Fiction & Fantasy, Science Fiction, Adventure, Cyberpunk, Hard Science Fiction, Military
Size: 209 pages
Free eBook download for Kindle from 25 June 2019 onward  

Rating: 4.30 / 5
15 reviews

Stealthy Steps (Nanostealth Book 1)

by Vikki Kestell

Stealthy Steps, Nanostealth | Book 1Gemma Keyes was an ordinary, unexceptional young woman with a lackluster life until an overheard conversation ends her budding career—and her loyalty to an old friend puts her very existence in jeopardy.My name is Gemma Keyes. Other than my name, I am utterly forgettable—so those who never paid much attention to me in the first place haven’t exactly noticed that I’ve disappeared. Vanished. Oh, it’s much more complicated than it sounds. And let me tell you, invisibility comes with its own set of problems.I should tell you about Dr. Daniel Bickel, world-renowned nanophysicist. We used to work together, but I’ll be candid with you: He’s supposed to be dead. Well, he’s not. (Imagine my surprise.) Instead of the proverbial “six feet under,...

Genre: Crime, Thriller & Mystery, Thrillers, Science Fiction & Fantasy, Fantasy, Fiction, Religious Fiction, Science Fiction, Christian Fantasy, Hard Science Fiction, Metaphysical & Visionary, Teen & Young Adult
Size: 300 pages
Free eBook download for Kindle from 25 June 2019 onward  

Rating: 4.30 / 5
11 reviews

Astrum Vermis

by John Peaseland

Frank exists in the less than caring Olympus Retirement Care Home for the Elderly and Infirm. Daily tormented by Kevin his one to one helper, he is often left in his wheelchair to fend for himself in the back garden plagued by a mist of biting midges. Without family or friends he prays every evening for death to release him from his purgatory but every morning he wakes disappointed. When he is selected by a nefarious organisation for an experimental brain transplant he is without concern; that is until he finds himself transformed into the body of a mechanical spider on a mission to save the world from extraterrestrial killer worms.As Frank becomes stronger, faster and wiser his new employers decide he is more of a liability than an asset and decide to liquidate him. Frank has other ideas....

Genre: Fiction, Action & Adventure, Science Fiction & Fantasy, Science Fiction, Adventure, Hard Science Fiction, Teen & Young Adult
Size: 274 pages
Free eBook download for Kindle from 25 June 2019 onward  

Rating: 4.00 / 5
10 reviews

The Transmuter's Daughter

by Laurence Dahners

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Genre: Science Fiction & Fantasy, Hard Science Fiction
Size: 281 pages
Free eBook download for Kindle from 25 June 2019 onward  

Rating: 4.00 / 5
2 reviews

Koinobi: Book one of the Koinobi Trilogy

by Reid Minnich

How far would you go to help a parasitic insect from the stars?Tweeskzaht nudges human civilization and technology forward from the shadows. Unaware of the war in the stars above it, Earth is in the cross-hairs of both sides. To save her adopted home, she must reveal herself to a small band of humans. Will Mike’s self-sacrifice, Kindra’s cunning, and David’s intelligence be enough to save Earth from becoming a hunting ground?...

Genre: Fiction, Science Fiction & Fantasy, Science Fiction, First Contact, Hard Science Fiction
Size: 207 pages
Free eBook download for Kindle from 25 June 2019 onward  

Rating: 3.20 / 5
7 reviews

Any Now: A Mind Bending Thriller

by William Bowden

Physicist Rhoda Mollo has been consigned to the fringes of what can just about be called respectable science, but even there her work is seen as more heretical than theoretical.

But strange results from the world’s largest atom smasher threaten to put her center stage, and in doing so unwittingly expose an Earth shattering discovery being kept secret from the world.

Those in possession of that secret seek to keep attention away from Rhoda by any means, only to find that she is likely a solution to a pressing problem—what is it that they have found, and why do the omnipotent organisation known as the Veil want it?

Pursuit of the answers will take them all to the very edge of reason, as they find themselves confronting the Universe itself.
<...

Genre: Crime, Thriller & Mystery, Thrillers, Fiction, Science Fiction & Fantasy, Science Fiction, First Contact, Hard Science Fiction, Metaphysical & Visionary
Size: 179 pages
Free eBook download for Kindle from 25 June 2019 onward  

Rating: 1.00 / 5
1 review

Destination Mars

by Ian Hideki

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Genre: Science Fiction & Fantasy, Science Fiction, Hard Science Fiction, Space Exploration, Space Opera
Size: 89 pages
Free eBook download for Kindle from 25 June 2019 onward  

Degrees Book 1: Saving The Earth

by Devon G. Crowe

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Genre: Fiction, Science Fiction & Fantasy, Science Fiction, Hard Science Fiction
Size: 270 pages
Free eBook download for Kindle from 25 June 2019 onward  

Cognition Chronicles: The Redstone Legacy

by J.R. Bale

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Genre: Crime, Thriller & Mystery, Thrillers, Science Fiction & Fantasy, Science Fiction, Hard Science Fiction
Size: 197 pages
Free eBook download for Kindle from 25 June 2019 onward  

The Zeta Grey War: The Draco (A Science Fiction Thriller)

by D F Capps

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Genre: Science Fiction & Fantasy, First Contact, Hard Science Fiction
Size: 289 pages
Free eBook download for Kindle from 25 June 2019 onward  

Rating: 4.50 / 5
24 reviews

Dark (The Dark Trilogy Book 1)

by Paul L Arvidson

IN THE STRANGE labyrinth of pipes on the planet called Dark, things are falling apart. Dun doesn't want to be a hero, he just wants to find an answer to the terrifying dreams he's been having. But the answers, the real answers, are going to take him places he's never imagined and tear him from the only home he's ever known.With a half finished map from his missing father, an old friend, a new friend and the mysterious Myrch to guide him, he journeys through parts of his world he's never imagined. Are his dreams real foretellings? Who can he trust to be who they say there are? What are the strange forces that seem to be literally pulling their world apart?As he travels through a world that is much bigger than he thought it was, what he won't know will kill him. And everyone he knows."…Pac...

Genre: Science Fiction & Fantasy, Epic, Adventure, Coming of Age, Metaphysical & Visionary, Hard Science Fiction, Post-Apocalyptic, Space Opera
Size: 299 pages
Free eBook download for Kindle from 24 June 2019 onward  

First Symptoms (chaotic by essence Book 1)

by richard deckard

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Genre: Science Fiction & Fantasy, Dystopian, Hard Science Fiction
Size: 26 pages
Free eBook download for Kindle from 24 June 2019 onward  

Conversity: Book Three of the HaChii Convergence

by Patrick O'Connor

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Genre: Science Fiction & Fantasy, Hard Science Fiction
Size: 314 pages
Free eBook download for Kindle from 24 June 2019 onward  

Good Vibrations - Graphic Novel: Book One of the HaChii Concatenation

by Patrick J. O'Connor

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Genre: Science Fiction & Fantasy, Hard Science Fiction
Size: 228 pages
Free eBook download for Kindle from 24 June 2019 onward  

Rating: 5.00 / 5
2 reviews

Faithful

by April Conrad

It is the 55th century, and Lehra Cranewing has always dreamed of traveling to the stars. Following the footsteps of her parents, she has joined ESEA, the Earth Space Exploration Administration, the paramilitary agency which controls all official exploratory missions for the Earth Star Alliance.Shortly after graduating from the academy, she makes a promise with her father that together, they will one day reach a world that has been coined “Fringe”, a habitable moon orbiting a gas giant 35 light years away. A project named “Resolute” seeks to send a craft there at 99% light speed, something that has never been done with a manned mission, and once it leaves, the craft will never return.Aydeline Rivervale is a rising star within ESEA, said to be the best efficiency expert in the whole...

Genre: Fiction, Gay & Lesbian, Science Fiction & Fantasy, Science Fiction, Hard Science Fiction, Space Exploration
Size: 293 pages
Free eBook download for Kindle from 23 June 2019 onward  

Rating: 4.00 / 5
4 reviews

The Zeta Grey War: How it Began (A Science Fiction Thriller)

by D F Capps

This is not a full length novel. It is a short story that sets the stage for the popular Zeta Grey War Series, in particular book 1, New Recruits, and introduces some of the main characters.A young navy lieutenant proposes to the love of his life, only to have things go horribly wrong. A decades-long struggle ensues to find justice and the means to overcome hopelessly advanced alien technology.The Zeta Grey War series is a look at the covert world of secret space programs, extraterrestrial intervention in our world, the arrival of help from other human races in the galaxy, and stunningly advanced technology already present today.The methods and agenda of a predatory alien race is also explored through the research of some of our planet's more advanced scholars and scientists.For the milita...

Genre: Fiction, Science Fiction & Fantasy, Science Fiction, Alien Invasion, Colonisation, First Contact, Hard Science Fiction
Size: 40 pages
Free eBook download for Kindle from 23 June 2019 onward  

Rating: 4.00 / 5
1 review

The Last Rats: A Bastion Saturn Short Prequel

by C. Chase Harwood

It’s the end of the 21st Century. The bulk of Humankind has conjoined itself with an artificial intelligence. A minority remain in opposition. A desperation has taken hold within the unincorporated zones where free humans still live. Many of them are choosing to leave Earth forever and fly to colonies on the moons of Saturn. In an ancient diner, Spruck Jones is about to make a bold move to change his flagging fortunes. Even the best laid plans almost never go as planned.The Last Rats is a short prequel that introduces the reader to some of the characters and the underlying world that is the basis for the space opera, Bastion Saturn....

Genre: Fiction, Science Fiction & Fantasy, Science Fiction, Dystopian, Hard Science Fiction, Teen & Young Adult
Size: 19 pages
Free eBook download for Kindle from 23 June 2019 onward  

Rating: 4.50 / 5
2 reviews

The Event

by Dick Caden

An indistinct message is received from space and is interpreted by many as the work of an Earth based government. When a second message is received, it tells mankind that the Universe is to be purged of all warlike and expansionist civilisations, but adds that the Earth is to be spared; but not without damage.After the one hour thirteen minute ‘Event’, the planet suffers stifling temperatures, a breakdown of infrastructure and the unexplained deaths of billions of seemingly healthy survivors. As the weeks and months pass, there is a belief that temperatures will stabilise and that normality will return. However, far from reaching equilibrium, the planet’s climate plunges ever downward until the Earth is covered in many metres of frozen snow. A global ice storm is followed by devastat...

Genre: Fiction, Science Fiction & Fantasy, Science Fiction, Dystopian, Hard Science Fiction
Size: 333 pages
Free eBook download for Kindle from 23 June 2019 onward  

Rating: 5.00 / 5
1 review

The Soul Cage

by David Booker

The inventor of the world's first teleportation device has been savagely murdered, and Global Inspector Burt Campbell is tasked to uncover who killed the infamous scientist. As he delves deeper into the case, strange things begin to happen. Spirits seem to be controlling deadly objects to viciously attack him, and according to the teleporter computer, the spirits are taking orders straight from the inventor's ghost.The only person with answers is the inventor's beautiful assistant, Penelope Preston... but she has secrets of her own....

Genre: Crime, Thriller & Mystery, Thrillers, Fiction, Science Fiction & Fantasy, Science Fiction, Hard Science Fiction, Metaphysical & Visionary
Size: 346 pages
Free eBook download for Kindle from 23 June 2019 onward  

Rating: 5.00 / 5
1 review

Signal Loss: A Hayden's World Short Story (Hayden's World Origins Book 2)

by S.D. Falchetti

You're on your own on the edge of nowhereLife aboard the Aristarchus isn’t much of an adventure, and Kyan just wants to do his job and get back to his family. When he discovers a mysterious object at the edge of the solar system and an unexpected contact during comms loss, data running turns life-or-death thirteen billion kilometers from home.Signal Loss is a science fiction short story set in the Hayden's World universe. The story is a 9000 word short read (< 1 hour) and is the perfect size for reading on the go....

Genre: Fiction, Action & Adventure, Short Stories, Science Fiction & Fantasy, Science Fiction, Adventure, Anthologies & Short Stories, Hard Science Fiction, Military, Space Exploration
Size: 49 pages
Free eBook download for Kindle from 22 June 2019 onward  

Rating: 3.80 / 5
3 reviews

The Martian Conspiracy

by John Read

The year is 2071. Devastated by the loss of his wife and son, NASA engineer John Orville signs up for a new life on Mars, implementing Project Bakersfield, a plan to combat deadly Martian storms. After a military unit lands on Mars, supposedly for a training exercise, Orville discovers the true purpose of Project Bakersfield. With the military unit going rogue, and a massive superstorm threatening imminent destruction, John Orville must fight to save the colony.

Praise for The Martian Conspiracy:

"A hard sci-fi novel with shades of Kim Stanley Robinson’s Red Mars, though much faster-paced. If, like me, you dream of living on Mars you should read this book.”
-Graeme Shimmin, Author of A Kill in the Morning
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Genre: Crime, Thriller & Mystery, Thrillers, Fiction, Action & Adventure, Science Fiction & Fantasy, Science Fiction, Hard Science Fiction, Space Exploration
Size: 232 pages
Free eBook download for Kindle from 22 June 2019 onward  

Critical Mass: Book One of the HaChii Convergence

by Patrick O'Connor

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Genre: Science Fiction & Fantasy, Hard Science Fiction
Size: 396 pages
Free eBook download for Kindle from 22 June 2019 onward  

Rating: 3.00 / 5
2 reviews

Eternal Love

by Lev Minkovsky

A moving love story with elements of sci-fi and humor and an epigraph from Nietzsche. A meditation on time and timelessness, memory and forgetting. A drama of an immortal man falling for a mortal woman. Read it if you want to learn what it is like to be immortal living amidst mortals and whether love can truly be eternal in the world where everything is transient and fleeting... A beautiful young woman in a university town meets a man at a bus stop. She doesn't realize that he is much older than he looks, because he doesn't age. A whirlwind romance follows, and they settle in a small single-story house, their future home of many decades and the only house she will ever own. Eventually the man moves to New York City and resurrects her in his memory in a truly astonishing way. ...

Genre: Fiction, Literary Fiction, Science Fiction & Fantasy, Science Fiction, Hard Science Fiction
Size: 57 pages
Free eBook download for Kindle from 22 June 2019 onward  

Rating: 5.00 / 5
1 review

The Lowdown in High Town (R.R. Johnson P.I. Book 1)

by DK Williamson

It is the year 2240 - In the shadow of the earth's sole remaining space elevator is the Red Light quarter of High Town. A dark world of glitz and glamour, celebrities and scavs, crime and corruption, desire and death.

The Red Light is an enigma, a place frequented by the rich and famous visiting topflight clubs, while a block away grim fate awaits the unwary and unwise who wander into the wrong refuse filled alley. A place inhabited by those with state-of-the-art intracranial reticulation and those who seek to enrich themselves through brute force. A place as seductive as it is sleazy, as entertaining as it is deadly.

The mean streets of the Red Light are a tough place to work, it's even tougher when you’re a private investigator whose client has been abducted. ...

Genre: Crime, Thriller & Mystery, Mystery, Fiction, Science Fiction & Fantasy, Science Fiction, Cyberpunk, Hard Science Fiction
Size: 285 pages
Free eBook download for Kindle from 22 June 2019 onward  

Consta: Unseen

by Jared G. Delta

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Genre: Science Fiction & Fantasy, Hard Science Fiction
Size: 26 pages
Free eBook download for Kindle from 22 June 2019 onward  

Rating: 2.00 / 5
1 review

Love Boat: The Instigation of Inherent Insanity

by Ingo Potsch

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Genre: Science Fiction & Fantasy, Fantasy, Science Fiction, Superhero, First Contact, Hard Science Fiction, Military
Size: 663 pages
Free eBook download for Kindle from 21 June 2019 onward  

Rating: 5.00 / 5
1 review

The Response (Alien Horror - Book 1)

by Gary Naiman

The greatest fighting machine the world has ever known. This tiny creature has survived dinosaurs, asteroids, mega-volcanoes, the ice age, and science’s deadliest insecticides. We've stomped her, sprayed her, and cursed her, but this time we went too far. She just received an interstellar signal to wipe us out.

Gary Naiman's sci-fi thriller opens with a global uprising of ten thousand trillion enraged ants, their target…us. With killer swarms devastating our cities and populations, a team of scientists discover the attacks have been triggered by an ill-advised NASA transmission, setting the stage for humanity's greatest battle against a formidable six-legged enemy and its alien parents.

If you’re looking for sci-fi in the spirit of Them and Starship Troopers...

Genre: Children's eBooks, Fiction, Horror, Science Fiction & Fantasy, Science Fiction, Alien Invasion, Colonisation, First Contact, Galactic Empire, Hard Science Fiction, Military, Post-Apocalyptic, Space Opera
Size: 170 pages
Free eBook download for Kindle from 21 June 2019 onward  

Rating: 4.00 / 5
2 reviews

From the Void (Alien Horror - Book 2)

by Gary Naiman

It Begins With A Blinding Light . . .We are about to be attacked by a superior alien force, the insect ancestors of our lowly ants. Book One "The Response" revealed our ants were brought here one hundred forty million years ago to rule our planet. Unfortunately, an ill-advised NASA transmission has alerted the aliens their interstellar colonization failed because of the unexpected rise of human beings. Really bad move, NASA! The enraged aliens have decided to unleash their deadly war machines against Earth with one purpose, our extermination, and they're considerably larger than their offspring. It's time to meet the parents.If you're looking for sci-fi in the spirit of "Them" and "Starship Troopers", consider "From the Void". Gary Naiman has written thirteen novels. His background include...

Genre: Fiction, Horror, Science Fiction & Fantasy, Science Fiction, Alien Invasion, Colonisation, First Contact, Galactic Empire, Hard Science Fiction, Military, Post-Apocalyptic, Space Opera
Size: 160 pages
Free eBook download for Kindle from 21 June 2019 onward  

Inia: English Version

by Del Gaudio, Raffaele

SYNOPSIS:
Located today, “Inia” draws on from some recent events of the scientific world, in particular from the accident happened at the LHC of Geneva. It tames few historical facts making them part of the plot.
Among the main characters there are: Eric and James, two men of extraterrestrial origin, which with other people are the maker of the last 500 hundred years of our history; Jonah, a brilliant scientist used and guided by aliens to reach their goal. Antoine, a brilliant young man grown among humans and unaware of his alien origin and many other characters which take part in the stories of the main characters and someone will become a key point for the novel.

THE ORIGIN OF THE STORY.
“Inia” is a planet quite similar to the earth fo...

Genre: Fiction, Science Fiction & Fantasy, Science Fiction, First Contact, Hard Science Fiction, Teen & Young Adult
Size: 252 pages
Free eBook download for Kindle from 21 June 2019 onward  

Rating: 4.20 / 5
14 reviews

Loss Of Reason: A Thriller (State Of Reason Mystery, Book 1)

by Miles A. Maxwell

One Of The Most Disturbing Stories You'll Ever Read

Distant for many years, Franklin out of Pennsylvania and his step-brother Everon out of Nevada are connected by a single link: Their sister Cynthia.

Enter The Nightmare

A nuclear bomb is detonated in New York. Banker, wife, mother, Cynthia lives in New York.

The military has quarantined the city. All bridges and tunnels have been destroyed or blocked. Easterly winds have forced the huge cloud of radiation is out over Long Island. But the wind is about to change.

Franklin climbs mountains. Everon can fly anything. And Cynthia's brothers are determined to find her.

If it were your sister, what would you do?
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Genre: Crime, Thriller & Mystery, Mystery, Thrillers, Suspense, Science Fiction & Fantasy, Fantasy, Epic, Historical, Fiction, Action & Adventure, Nonfiction, Romance, Science Fiction, Hard Science Fiction, Post-Apocalyptic
Size: 288 pages
Free eBook download for Kindle from 21 June 2019 onward  

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