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.
No filler. No bots. Just actually good books at prices that might still be suspiciously low.
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Didn’t grab it when you should have? These past picks are still worth your time.
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These Books Earned Our Seal of Approval—Snag Them Before They Vanish (Again)
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959 past books matching Sci-Fi
Ideal for readers looking for idea-driven science fiction with espionage, interstellar conflict, ethical questions, and fast-paced action.
Angelmass
Sci-Fi
Our take
Called “a serious SF novel sneakily posing as an enormous golden-age thrill ride” by Locus, Angelmass follows academic Jereko Kosta, who is forced to spy on colonies using mysterious particles that make humans calm, reasonable, and unable to lie. As war threatens, he discovers the particles may be more dangerous than either side understands, with a 4.3-star rating from more than 100 Amazon reviewers. Ideal for readers looking for idea-driven science fiction with espionage, interstellar conflict, ethical questions, and fast-paced action.
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About the book
"A serious SF novel sneakily posing as an enormous golden-age thrill ride" from the Hugo Award–winning, #1 New York Times–bestselling author (Locus).
Deep in space lies the black hole known as Angelmass, so called because it emits enigmatic particles with the unusual ability to render humans calm, reasonable, and incapable of lying—which would normally be seen as a good thing.
But not by everyone.
For while Empyrean human colonies on the edge of the galaxy utilize the power of the "angels," the Earth-based Pax empire views the emissions as a threat that could be used to subvert humanity.
Academic Jereko Kosta is pressed into service by the Pax to spy on the Empyrean, joining the crew of a ship actively hunting the particles. But what he learns turns out to be both scientifically fascinating and morally frightening.
When the Pax make an aggressive move that may lead to all-out war with the Empyrean, Kosta is the only one who can stop the conflict between the human powers and force them to see that the angels they're about to fight over are far from holy . . .
Timothy Zahn combines provocative ethical questions with the same level of vivid sci-fi action that made his Star Wars: Thrawn a New York Times-bestseller.
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Vietnam vet Albert “AJ” Jenkins never dreamed he’d have his own starship.
Junkyard Pirate
Sci-Fi
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About the book
Vietnam vet Albert “AJ” Jenkins never dreamed he’d have his own starship.
When a pile of scrap rocket parts falls and crushes the overweight curmudgeon, he thinks it’s finally the end. But just as he’s about to take one final breath, a snarky extraterrestrial offers him one last chance.
AJ’s life in return for the alien sharing his body.
With a little coaxing from his new inner resident, AJ’s broken carcass improves so much that even an old flame is impressed. But his bright outlook fizzles when he discovers he’s at ground zero of a galactic conspiracy to strip Earth for all it’s worth.
Will AJ’s rusty military skills stand a chance against alien invaders or will humanity fall?
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In Red Thunder by John Varley (4.4 out of 5 stars), a disgraced astronaut and four Florida teens race NASA and China to Mars in a homemade ship.
Red Thunder
Sci-Fi · Hard Sci-Fi · Space Exploration
Our take
In Red Thunder by John Varley (4.4 out of 5 stars), a disgraced astronaut and four Florida teens race NASA and China to Mars in a homemade ship. Clever, funny, and full of heart, this Hugo Award–winning author delivers a modern sci-fi classic about guts, friendship, and reaching for the impossible. Buckle up for lift-off.
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About the book
The race to Mars is heating up. As the United States and China battle for the glory of being first to the Red Planet, one washed-up astronaut, his resourceful cousin, and four Florida teens hatch a wild plan: build their own spaceship from junkyard scraps and beat them all to it.
Armed with duct tape, dreams, and a mysterious new power source that could change everything, this ragtag crew takes on governments, odds, and gravity itself. What begins as a reckless fantasy turns into a daring mission that tests courage, friendship, and the limits of human ingenuity.
John Varley’s Red Thunder is a fast-paced, character-driven space adventure packed with humor, heart, and the thrill of impossible ambition made real.
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With 4.2 stars on Amazon and genre-defying charm, this sequel is perfect for fans of swashbuckling sci-fi and larger-than-life storytelling.
The Return of Santiago
Sci-Fi
Our take
A thief. A dancer. A galaxy waiting for its next legend. The Return of Santiago brings readers back to Mike Resnick’s unforgettable frontier universe in a bold space western full of rogues, heroes, and myth-making. With 4.2 stars on Amazon and genre-defying charm, this sequel is perfect for fans of swashbuckling sci-fi and larger-than-life storytelling.
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About the book
A new bard is searching for a legend. But legends are hard to find—and even harder to survive.
Thief and dreamer Danny Briggs wants more than riches. He wants to be remembered. When he stumbles upon the lost manuscript of the legendary balladeer who chronicled the galaxy’s heroes, he sees a chance to write his own myth. But first, he needs a new Santiago—a larger-than-life outlaw who fights for justice, not laws.
With Waltzin’ Matilda, the last descendant of Santiago, at his side, Briggs scours the galaxy’s roughest corners in search of the next folk hero. What he finds will test his courage, his loyalty, and his own place in the story.
The Return of Santiago is a thrilling space western full of outlaws, legends, and the myths we choose to believe.
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A young geologist.
Mars (The Grand Tour)
Sci-Fi
Our take
A young geologist. A hostile planet. A mission that could change humanity forever. In Mars, Ben Bova’s acclaimed sci-fi classic, the first manned expedition to the red planet uncovers more than they bargained for. With 4.4 stars on Amazon and praise from Ray Bradbury and Arthur C. Clarke, this Grand Tour installment is essential reading for any space exploration fan.
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About the book
Jamie Waterman has always dreamed of Mars. Now he’s walking on it.
As a young Navajo geologist, Jamie is selected for the first manned mission to the red planet. Alongside a diverse team of scientists and astronauts, he sets out to explore a world that has captivated human imagination for centuries. But Mars is no welcoming frontier. Harsh terrain, political infighting, and a discovery that challenges everything they thought they knew threaten to derail the mission.
When the crew uncovers a massive canyon that dwarfs anything on Earth, they face a choice that could alter the future of humanity.
Mars is a visionary science fiction epic from Grand Master Ben Bova, blending scientific realism with gripping exploration. This is not just first contact with a planet—it is first contact with destiny.
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A hostile new world.
Proxima
Sci-Fi
Our take
A hostile new world. A forced colony. Humanity's last hope. In Proxima, Stephen Baxter crafts a bold hard sci-fi epic of survival and discovery. With 4.1 stars on Amazon and comparisons to Arthur C. Clarke, this spacefaring thriller explores the cost of starting over on a distant planet where no one wants to be—but everyone must fight to survive.
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About the book
A new world. A reluctant colony. And the infinite future of humanity hanging in the balance.
Proxima Centauri b is a planet orbiting the closest red dwarf to Earth. Harsh, untamed, and light-years from home, it offers a chance for survival in a galaxy where Earth is becoming increasingly unstable. But no one wants to be a settler. Forced into exile, the colonists face isolation, danger, and the crushing weight of the unknown.
As war brews back in the solar system and tensions rise among the stranded, the dream of a second Earth grows fragile.
Proxima is a sweeping hard science fiction epic from acclaimed author Stephen Baxter, exploring colonization, survival, and humanity’s desperate reach for a future beyond the stars.
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At the fringe of human space, Urban commands a captured alien starship on a voyage toward the fallen Hallowed Vasties.
Edges
Sci-Fi
Our take
At the fringe of human space, Urban commands a captured alien starship on a voyage toward the fallen Hallowed Vasties. As his crew confronts mysteries, dangers, and ethical dilemmas along the abandoned migration path, they inch closer to learning what destroyed humanity’s greatest civilization. Edges offers a riveting return to Linda Nagata’s Nanotech Succession universe.
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About the book
At the farthest edge of human expansion, Deception Well stands as a fragile refuge against a galaxy scarred by catastrophe. Entire worlds have already fallen to relentless alien machines, and the distant cradle of civilization—the Hallowed Vasties—has collapsed into dust. No one knows what destroyed that vast, star spanning domain, but Urban intends to uncover the truth.
Armed with a captive alien starship and a crew of explorers and scientists, he launches a daring mission back toward humanity’s abandoned heartland. Each light year brings new mysteries and threats, challenging their assumptions about survival, purpose, and what may have evolved among the ruins.
An entry point into the acclaimed Nanotech Succession universe, Edges delivers bold ideas, tense discovery, and the haunting question of what humanity becomes at the brink of extinction.
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She's a soldier--Noemi Vidal is willing to risk anything to protect her planet, Genesis, including her own life.
Defy the Stars
Sci-Fi
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About the book
She's a soldier--Noemi Vidal is willing to risk anything to protect her planet, Genesis, including her own life. To their enemies on Earth, she's a rebel.
He's a machine--Abandoned in space for years, utterly alone, Abel's advanced programming has begun to evolve. He wants only to protect his creator, and to be free. To the people of Genesis, he's an abomination.
Noemi and Abel are enemies in an interstellar war, forced by chance to work together as they embark on a daring journey through the stars. Their efforts would end the fighting for good, but they're not without sacrifice. The stakes are even higher than either of them first realized, and the more time they spend together, the more they're forced to question everything they'd been taught was true.
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What would you be willing to risk for a lifetime of fortune?Emmett Atwater isn’t just leaving Detroit; he’s leaving Earth.
Nyxia
Sci-Fi
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About the book
What would you be willing to risk for a lifetime of fortune?
Emmett Atwater isn’t just leaving Detroit; he’s leaving Earth. Why the Babel Corporation recruited him is a mystery, but the number of zeroes on their contract has him boarding their lightship and hoping to return to Earth with enough money to take care of his family.
Forever.
Before long, Emmett discovers that he is one of ten recruits, all of whom have troubled pasts and are a long way from home. Now each recruit must earn the right to travel down to the planet of Eden—a planet that Babel has kept hidden—where they will mine a substance called Nyxia that has quietly become the most valuable material in the universe.
But Babel’s ship is full of secrets. And Emmett will face the ultimate choice: win the fortune at any cost, or find a way to fight that won’t forever compromise what it means to be human.
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It fits readers who want sci-fi horror driven by claustrophobia, psychological strain, and survival under pressure.
The Luminous Dead
Horror · Sci-Fi
Our take
Isolation becomes its own form of terror when the person guiding you may be the one pushing you deeper into danger. In The Luminous Dead, Gyre takes a high-paying caving mission on a hostile planet and finds herself trapped underground with failing trust, buried secrets, and a growing sense that something is following her. It fits readers who want sci-fi horror driven by claustrophobia, psychological strain, and survival under pressure.
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About the book
Bram Stoker Award nominee for Best First Novel!
"This claustrophobic, horror-leaning tour de force is highly recommended for fans of Jeff VanderMeer’s Annihilation and Andy Weir’s The Martian." — Publishers Weekly (starred review)
The thrilling, atmospheric debut from the author of The Death of Jane Lawrence, a sci-fi horror novel with the intensive drive of The Martian and Gravity and the creeping dread of Annihilation, in which a caver on a foreign planet finds herself on a terrifying psychological and emotional journey for survival.
When Gyre Price lied her way into this expedition, she thought she’d be mapping mineral deposits, and that her biggest problems would be cave collapses and gear malfunctions. She also thought that the fat paycheck—enough to get her off-planet and on the trail of her mother—meant she’d get a skilled surface team, monitoring her suit and environment, keeping her safe. Keeping her sane.
Instead, she got Em.
Em sees nothing wrong with controlling Gyre’s body with drugs or withholding critical information to “ensure the smooth operation” of her expedition. Em knows all about Gyre’s falsified credentials, and has no qualms using them as a leash—and a lash. And Em has secrets, too . . .
As Gyre descends, little inconsistencies—missing supplies, unexpected changes in the route, and, worst of all, shifts in Em’s motivations—drive her out of her depths. Lost and disoriented, Gyre finds her sense of control giving way to paranoia and anger. On her own in this mysterious, deadly place, a masterpiece of claustrophobic horror surrounded by darkness and the unknown, Gyre must overcome more than just the dangerous terrain and the Tunneler which calls underground its home if she wants to make it out alive—she must confront the ghosts in her own head.
But how come she can’t shake the feeling she’s being followed?
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Sarah Collier’s battle with early Alzheimer’s collides with a biotech breakthrough that could save her life—or destroy it.
Geneva
Sci-Fi · Thriller
Our take
Sarah Collier’s battle with early Alzheimer’s collides with a biotech breakthrough that could save her life—or destroy it. Amid media frenzy, dangerous intrigue, and escalating symptoms, Sarah and her husband Daniel must fight for their future. With trust unraveling and time slipping away, they face an impossible choice: how far will they go for love and survival?
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About the book
Nobel laureate Sarah Collier stepped away from her groundbreaking work to focus on family, but her own struggle with early-onset Alzheimer’s looms large. When she’s invited to a biotech conference showcasing Mauritz Schiller’s revolutionary research, Sarah is drawn back into the scientific spotlight—and into a storm of danger.
Schiller’s technology offers hope, even the possibility of saving Sarah’s life, but its potential has made it a target for shadowy investors, a relentless journalist, and betrayal from within. As her symptoms worsen and trust erodes, Sarah must confront the terrifying question: Is this breakthrough her salvation or her destruction?
Caught between love, ambition, and survival, Sarah and her husband Daniel must face how far they’ll go to protect one another—and what it will cost.
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Haviland Tuf, an honest trader with a love for cats, inherits a legendary seedship with godlike powers.
Tuf Voyaging
Sci-Fi
Our take
Haviland Tuf, an honest trader with a love for cats, inherits a legendary seedship with godlike powers. Tasked with solving humanity’s galactic disasters—from monster infestations to plague-wielding tyrants—Tuf’s wit and integrity are the universe’s last hope in a sea of rogues and chaos.
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About the book
Haviland Tuf, a simple space trader with a love for cats, never expected to wield the universe’s most powerful tool: a legendary seedship capable of genetic manipulation on a godlike scale. Now, as the sole heir to Earth’s Ecological Engineering Corps, Tuf must solve the catastrophic messes humanity has made across colonized worlds.
From rampaging monsters to overpopulation crises and dictators wielding plagues, every mission pits Tuf’s unyielding wit and integrity against chaos. In a galaxy teeming with rogues and villains, Tuf’s resourcefulness—and his remarkable seedship—are all that stand between disaster and survival.
With a ship full of biological wonders and a sharp mind, Tuf proves that sometimes, the universe’s greatest hero is also its most unexpected.
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