Past Kindle Book Deals but Still Must Read Books!
Looking for must read books you missed the first time around? You’re in the right place. This is where all of our past Kindle book deals live—the ones good enough to click, even if the discount’s gone. Every book here was hand-picked by our team, featured in a daily deal, and still earns a spot on your TBR.
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These Books Earned Our Seal of Approval—Snag Them Before They Vanish (Again)
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125 past books matching Hard Sci-Fi
Outlaws, uplifted dolphins, and a galaxy on the brink.
Heaven’s Reach
Sci-Fi · First Contact · Hard Sci-Fi
Our take
Outlaws, uplifted dolphins, and a galaxy on the brink. This thrilling sci-fi epic from the New York Times bestselling author of Startide Rising delivers nonstop adventure, sweeping scale, and a mystery that threatens all life. With 4.4 stars on Amazon and a prophecy no one wants to see fulfilled, Heaven’s Reach is space opera that hits hard and fast.
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About the book
War has come to Jijo, and this time, the galaxy is watching.
Six outlawed races found fragile peace on a hidden planet. That peace ends when the Jophur arrive—ancient enemies with a twisted agenda that could unravel everything.
The refugees’ only hope lies with the Earthship Streaker, a vessel crewed by uplifted dolphins and their human commander. Their mission is simple but suicidal: lure the Jophur into space and disappear into the unknown.
Across the stars, things are unraveling fast. Earth is under siege. White dwarfs are exploding without cause. Prophecies are resurfacing. And the secrets aboard Streaker might be powerful enough to shift the fate of the universe.
One crew, one ship, one last shot at survival. The countdown has already started.
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On an island built from the world’s electronic waste, survival depends on enduring the systems that profit from human ruin.
Waste Tide
Dystopian · Hard Sci-Fi · Techno-Thriller
Our take
On an island built from the world’s electronic waste, survival depends on enduring the systems that profit from human ruin. Waste Tide follows Mimi, a migrant waste worker caught in a violent struggle between gangs, investors, and revolutionaries in a near-future China poisoned by capitalism and control. This eco-tech thriller blends class conflict, environmental collapse, and sharp social vision into a story that feels both harrowing and urgently real.
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About the book
A Locus Award Finalist for Best First Novel. "An accomplished eco-techno-thriller with heart and soul as well as brain." —David Mitchell, New York Times-bestselling author of Cloud Atlas
Translated by Ken Liu, who brought Cixin Liu's Hugo Award-winning The Three Body Problem to English-speaking readers.
Mimi is drowning in the world's trash.
She's a waste worker on Silicon Isle, where electronics—from cell phones and laptops to bots and bionic limbs—are sent to be recycled. These amass in towering heaps, polluting every spare inch of land. On this island off the coast of China, the fruits of capitalism and consumer culture come to a toxic end.
Mimi and thousands of migrant waste workers like her are lured to Silicon Isle with the promise of steady work and a better life. They're the lifeblood of the island's economy, but are at the mercy of those in power.
A storm is brewing, between ruthless local gangs, warring for control. Ecoterrorists, set on toppling the status quo. American investors, hungry for profit. And a Chinese-American interpreter, searching for his roots.
As these forces collide, a war erupts—between the rich and the poor; between tradition and modern ambition; between humanity's past and its future.
Mimi, and others like her, must decide if they will remain pawns in this war or change the rules of the game altogether.
"A chilling sci-fi novel about class war and trash in near-future China, and the people the world's economy leaves behind . . . Pressingly relevant." —The Verge
"Thrilling . . . fresh." —The Washington Post
"Viscerally gripping action . . . sheer excellence." —Kirkus Reviews (starred review)
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No hyperspace, just hard science.
Gravity Wars: Interstellar Assault
Sci-Fi · Hard Sci-Fi · Military Sci-Fi · Space Opera
Our take
No hyperspace, just hard science. In Interstellar Assault, a generational starship flees annihilation while three alien missiles close in—over 300 years. From bestselling author Vaughn Heppner comes a gripping saga of nuclear-powered ships, generational heroes, and the grim reality of space war. Fans of The Expanse and Red Mars will devour this 4.4-star hard sci-fi epic.
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About the book
No warp drives. No telepathy. No shortcuts. Just pure science and the brutal reality of deep space warfare.
As a ravaged race flees the relentless Vims aboard a massive generational ship, the clock starts ticking—three interstellar missiles have been launched. They’ll take 300 years to arrive, but the chase has begun.
From the heroic Sargon to his descendants Ningal and Assur, this is a saga of survival, betrayal, and raw courage. Meanwhile, on 2060 Earth, powerful CEO James Petty and Colonel Mike Steele helm the planet’s desperate response: the Orion, a nuclear-bomb-propelled starship.
In a war measured in centuries and fought across stars, only one truth remains—gravity always wins.
Welcome to Interstellar Assault—where the science is real, and the stakes couldn’t be higher.
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Ideal for readers looking for cerebral science fiction, Gothic atmosphere, recurring realities, and a slowly unfolding mystery.
Eversion
Sci-Fi · Hard Sci-Fi · Space Exploration · Space Opera
Our take
Dr. Silas Coade serves as physician aboard a series of expeditions separated by centuries, from a sailing ship and an airship to a spacecraft approaching a mysterious alien structure. As each journey ends in disaster, Silas begins to question why events keep repeating. Ideal for readers looking for cerebral science fiction, Gothic atmosphere, recurring realities, and a slowly unfolding mystery.
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About the book
From the master of the space opera comes a dark, mind-bending adventure spread across time and space, where Doctor Silas Coade is tasked with keeping his crew safe as they adventure across the galaxy in search of a mysterious artifact.
In the 1800s, a sailing ship crashes off the coast of Norway. In the 1900s, a Zepellin explores an icy canyon in Antarctica. In the far future, a spaceship sets out for an alien artifact. Each excursion goes horribly wrong. And on every journey, Dr. Silas Coade is the physician, but only Silas seems to realize that these events keep repeating themselves. And it's up to him to figure out why and how. And how to stop it all from happening again.
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Good for readers who want cinematic survival thrillers with grief, guilt, and high-concept danger.
Whalefall
Sci-Fi · Hard Sci-Fi
Our take
A USA TODAY bestseller called “powerfully humane” by Owen King, Whalefall follows a scuba diver searching for his father's remains who gets swallowed by a sperm whale and has only one hour of oxygen to escape while confronting personal demons, with a 4.1-star rating from more than 3,200 Amazon reviewers. Good for readers who want cinematic survival thrillers with grief, guilt, and high-concept danger.
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About the book
A USA TODAY BESTSELLER
From the Pulitzer Prize–winning author of Angel Down comes a scientifically accurate thriller about a scuba diver who’s been swallowed by an eighty-foot, sixty-ton sperm whale and has only one hour to escape before his oxygen runs out.
Jay Gardiner has given himself a fool’s errand—to find the remains of his deceased father in the Pacific Ocean off the coast of Monastery Beach. He knows it’s a long shot, but Jay feels it’s the only way for him to lift the weight of guilt he has carried since his dad’s death by suicide the previous year.
The dive begins well enough, but the sudden appearance of a giant squid puts Jay in very real jeopardy, made infinitely worse by the arrival of a sperm whale looking to feed. Suddenly, Jay is caught in the squid’s tentacles and drawn into the whale’s mouth where he is pulled into the first of its four stomachs. He quickly realizes he has only one hour before his oxygen tanks run out—one hour to defeat his demons and escape the belly of a whale.
Suspenseful and cinematic, Whalefall is an “powerfully humane” (Owen King, New York Times bestselling author) thriller about a young man who has given up on life…only to find a reason to live in the most dangerous and unlikely of places.
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Good for readers who like space opera, artificial intelligence, empire, betrayal, and revenge.
Ancillary Justice
Sci-Fi · LGBTQIA+ · Hard Sci-Fi · Space Exploration · Space Opera
Our take
Winner of the Hugo, Nebula, and Arthur C. Clarke Awards, Ancillary Justice follows Breq, a warship AI left with one human body, unanswered questions, and a mission for revenge after an act of treachery destroys what she once was, with a 4.3-star rating from more than 20,900 Amazon reviewers. Good for readers who like space opera, artificial intelligence, empire, betrayal, and revenge.
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About the book
Winner of the Hugo, Nebula, and Arthur C. Clarke Awards: This record-breaking novel follows a warship trapped in a human body on a quest for revenge. A must read for fans of Ursula K. Le Guin and James S. A. Corey.
"There are few who write science fiction like Ann Leckie can. There are few who ever could." -- John Scalzi
On a remote, icy planet, the soldier known as Breq is drawing closer to completing her quest.
Once, she was the Justice of Toren -- a colossal starship with an artificial intelligence linking thousands of soldiers in the service of the Radch, the empire that conquered the galaxy.
Now, an act of treachery has ripped it all away, leaving her with one fragile human body, unanswered questions, and a burning desire for vengeance.
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Explore the future we’re still catching up to with Isaac Asimov’s I, Robot (4.5 stars on Amazon!).
I, Robot
Dystopian · Hard Sci-Fi
Our take
Explore the future we’re still catching up to with Isaac Asimov’s I, Robot (4.5 stars on Amazon!). This science fiction classic questions what happens when machines get smarter than their makers. Robots with humor, mind-reading powers—and maybe world domination plans. If you haven’t read this masterwork yet, it’s time. Grab it today and meet your mechanical overlords.
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About the book
This classic science fiction masterwork by Isaac Asimov weaves stories about robots, humanity, and the deep questions of existence into a novel of shocking intelligence and heart.
“A must-read for science-fiction buffs and literature enjoyers alike.”—The Guardian
I, Robot, the first and most widely read book in Asimov’s Robot series, forever changed the world’s perception of artificial intelligence. Here are stories of robots gone mad, of mind-reading robots, and robots with a sense of humor. Of robot politicians, and robots who secretly run the world—all told with the dramatic blend of science fact and science fiction that has become Asimov’s trademark.
The Three Laws of Robotics:
1) A robot may not injure a human being or, through inaction, allow a human being to come to harm.
2) A robot must obey orders given to it by human beings except where such orders would conflict with the First Law.
3) A robot must protect its own existence as long as such protection does not conflict with the First or Second Law.
With these three, simple directives, Isaac Asimov formulated the laws governing robots’ behavior. In I, Robot, Asimov chronicles the development of the robot from its primitive origins in the present to its ultimate perfection in the not-so-distant future—a future in which humanity itself may be rendered obsolete.
“Tremendously exciting and entertaining . . . Asimov dramatizes an interesting question: How can we live with machines that, generation by generation, grow more intelligent than their creators and not eventually clash with our own invention?”—The Chicago Tribune
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Perfect for fans of The Murderbot Diaries and mystery lovers alike.
Fugitive Telemetry
Sci-Fi · Hard Sci-Fi
Our take
Murderbot just wanted a quiet day of media bingeing. Instead? There’s a dead human in the station mall—and now it’s stuck helping solve the murder. Fugitive Telemetry is a whodunit with hacking, sarcasm, and your favorite socially awkward SecUnit. Perfect for fans of The Murderbot Diaries and mystery lovers alike. Click now to investigate the most Murderbot murder mystery yet.
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About the book
Murderbot would really prefer to be watching its favorite shows—but there’s a dead human in the Preservation Station mall, and for some reason, that’s now its problem.
No, Murderbot didn’t kill them. If it had, it wouldn’t have been sloppy about it. But since everyone seems to care, it agrees (grudgingly) to help investigate. That means working with humans. Again. Voluntarily. Ugh.
In Fugitive Telemetry, the snarkiest SecUnit in the galaxy trades in explosions for clues, hacking, and reluctantly solving a murder mystery. Packed with wit, heart, and perfectly calibrated sarcasm, this novella proves that Murderbot is as endearing solving crimes as it is fighting off corporate assassins.
Come for the mystery. Stay for the reluctant teamwork. And maybe a little emotional growth. Maybe.
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Kidnapped humans.
Network Effect
Mystery · Sci-Fi · Hard Sci-Fi
Our take
Kidnapped humans. Unwanted reunions. Zero downtime for binging media. Network Effect is the award-winning full-length novel in Martha Wells’ Murderbot Diaries—and it’s Murderbot at its snarkiest, most reluctant best. Winner of the Hugo, Nebula, and Locus Awards, this is peak sci-fi with bite. Click now for action, sarcasm, and the galaxy’s most relatable security unit.
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About the book
Murderbot just wants to binge its favorite shows in peace. Instead, it’s dealing with kidnapped humans, a sudden rescue mission, and an old frenemy in urgent need of help.
In Network Effect, the first full-length novel in Martha Wells’ Hugo, Nebula, and Locus Award–winning Murderbot Diaries, everyone’s favorite anxiety-ridden, media-obsessed security unit is once again pulled into a life-or-death situation it absolutely didn’t ask for. Armed with sarcasm, weaponized competence, and zero patience, Murderbot must decide if saving the humans (again) is really worth it.
Full of razor-sharp wit, action, and deeply relatable A.I. angst, Network Effect delivers everything fans love—now with more pages, more problems, and more Murderbot.
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Perfect for fans of The Martian and Project Hail Mary.
Colony Two Mars
Sci-Fi · Hard Sci-Fi · Space Exploration
Our take
She’s the last survivor on Mars—until a man appears in the airlock… and dies. The twist? He already died years ago. In this gripping sci-fi thriller, one woman must cross Jezero Crater to find the truth—or face dying alone. Perfect for fans of The Martian and Project Hail Mary. Click now to uncover what lies in Colony Two.
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About the book
Stranded. Contaminated. Forgotten.
As the sole survivor of a doomed ISA mission, she’s marooned on Mars—declared a biohazard and cut off from Earth. Her fate is to live out her final days in isolation… until an unconscious man appears in the colony’s airlock.
He dies before speaking a word.
Even more impossible? DNA confirms he’s a long-dead colonist from Colony Two—an outpost presumed lost years ago.
With only one lead and dwindling time, she must brave the deadly expanse of Jezero Crater to uncover the truth. Because if someone—or something—is still alive out there, it may be her last chance for answers… and survival.
Perfect for fans of The Martian and Arrival, this is a pulse-pounding, cerebral thriller about survival, identity, and the mysteries buried beneath Martian dust.
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When tomorrow can be erased, love becomes a dangerous anomaly.
The End of Eternity
Sci-Fi · Hard Sci-Fi · Space Opera · Time Travel
Our take
When tomorrow can be erased, love becomes a dangerous anomaly. In The End of Eternity, Andrew Harlan serves as an Eternal, altering history to engineer a safer future for humanity, until he falls in love and questions the system he upholds. His rebellion against a controlled timeline threatens the vast machinery of time itself in this cerebral science fiction classic.
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About the book
A spellbinding novel set in the universe of Isaac Asimov’s classic Galactic Empire series and Foundation series
Due to circumstances within our control . . . tomorrow will be canceled.
The Eternals, the ruling class of the Future, had the power of life and death not only over every human being but over the very centuries into which they were born. Past, Present, and Future could be created or destroyed at will.
You had to be special to become an Eternal. Andrew Harlan was special. Until he committed the one unforgivable sin—falling in love.
Eternals weren’t supposed to have feelings. But Andrew could not deny the sensations that were struggling within him. He knew he could not keep this secret forever. And so he began to plan his escape, a plan that changed his own past . . . and threatened Eternity itself.
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Humanity’s first interstellar mission was meant to bring peace—not bodies.
Starman’s Saga
Sci-Fi · Hard Sci-Fi · Space Exploration
Our take
Humanity’s first interstellar mission was meant to bring peace—not bodies. BerthRight delivers gritty sci-fi suspense as Leif Grettison, a lottery “winner” with a soldier’s past, becomes the glue holding a fractured crew together. Think The Martian meets The Expanse. 4.5 stars on Amazon. Click now to suit up for a journey where everything can—and does—go wrong.
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About the book
In 2069, Earth’s last shot at peace is one spaceship—and one crew—away from unraveling.
Leif Grettison wasn’t supposed to be here. He won the final seat on humanity’s first interstellar mission in a global lottery. But he’s no average joe—he’s a battle-hardened paramedic, lab tech, and former Army Ranger. Now he’s the unofficial muscle aboard a ship full of fragile alliances and national grudges, barreling toward an alien world no one really understands.
The journey spans fourteen Earth years. The dangers? Immeasurable.
When systems fail, tensions spike, and crew members start dying, Leif must become more than a handyman—he must be humanity’s last line of defense against the unknown.
Because space doesn’t care how well you planned. And out here, there’s no calling for backup.
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