They made their presence on Earth known thirteen years ago. Providing technology and scientific insights far beyond what mankind was capable of. They became indispensable advisors and promised even more gifts that we just couldn't pass up. We called them Gurus. It took them a while to drop the other shoe. You can see why, looking back.

Jim Marlowe and his strange-looking Martian friend, Willis, are allowed to travel only so far. But one day Willis unwittingly tunes in to a treacherous plot that threatens all the colonists on Mars, and it sets Jim off on a terrifying adventure that could save - or destroy - them all.

Cole Riker is a Slip Runner. A contractor tasked with finding alien salvage in exchange for credits. For an ex-smuggler like Cole, there’s a catch: Don’t break the terms of parole. That means doing things by the book. Find salvage, turn it in, get paid. But everything changes when a retrieval mission lands him in a previously unknown sector. There, he finds the material he’s been sent to recover, along with something more. A brand-new form of ancient alien life.

Perhaps it wasn't from our time, perhaps it wasn't even from our universe, but the arrival of the 300-kilometer long stone was the answer to humanity's desperate plea to end the threat of nuclear war. Inside the deep recesses of the stone lies Thistledown: the remnants of a human society, versed in English, Russian and Chinese. The artifacts of this familiar people foretell a great Death caused by the ravages of war, but the government and scientists are unable to decide how to use this knowledge.

More than 700 years into its journey, a massive generation starship carries thousands of passengers to a new home that only their descendants - hundreds more years into the future - will live to see. Life aboard the ship is a daily struggle. One young welder copes by writing a series of letters to an Earth he never knew. The experiences he describes are not as exciting as the ancient works of science fiction made it out to be - but that is about to change. An eccentric old man has offered to train him for an unprotected spacewalk - a dangerous ritual known as “facing space”.

When a high-value scientist is taken hostage inside the galaxy's most dangerous prison, Halek Cain is the only man for the job. The last remaining survivor of the Reaper program, Hal is an unstoppable force of fuel and madness. A veteran amputee-turned-cyborg, he has a history of violence and a talent for killing that is unmatched by any soldier. With the promise of freedom as his only incentive, he'll stop at nothing to earn back his life from the people who made him, imprisoned him, and were too afraid to let him die.

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.

Two hundred years ago, a fleet of colony ships left Earth and started a settlement on Proxima Centauri. Centurion Space Force pilot Nathan Stacker didn't expect to return home to find his wife dead. He didn't expect the murderer to look just like him, and he definitely didn't expect to be the one to take the blame. But his wife had control of a powerful secret. A secret that stretches across the light years between two worlds and could lead to the end of both. Now that secret is in Nathan's hands, and he's about to make the most desperate evasive maneuver of his life.

Get ready to experience two more origin stories in the Backyard Starship universe.

Benjamin Wrath is among the first officers to get sent to the Andromeda Galaxy. As part of the Sentient Crime Division, millions of light years from Earth, Wrath's precinct is in charge of maintaining order in a chaotic new frontier, tasked with protecting the rights of all sentient beings.

Michael Freeman is a disabled veteran who had just been fired from his mind-numbing cubicle job, which allowed his opportunistic girlfriend to dump him. Now, he only wants to spend some time at his grandfather's mountain cabin so he can unwind, away from the drudgery of daily life and with a cold beer in his hands. Standing in his way is an ancient spaceship with an emotional AI, nanites that have invaded his body, an international crime syndicate, a suicidal FBI agent on a vigilante mission, terrorists . . . and that's just the beginning.

Equipped with the entirety of human knowledge, a sentient ship is launched on a last-ditch journey to find a new home for civilization. Trillions of miles. Tens of thousands of years. In the space between, the AI has plenty of time to think about life, the vastness of the universe, everything it was meant to do, and—with a perspective created but not limited by humans—what it should do.

. C. “Scar” Gordon was on the French Riviera recovering from a tour of combat in Southeast Asia, but he hadn’t given up his habit of scanning the personals in the newspaper. One ad in particular leapt out at him: "Are you a coward? This is not for you. We badly need a brave man. He must be 23 to 25 years old, in perfect health, at least six feet tall, weigh about 190 pounds, fluent English with some French, proficient with all weapons, some knowledge of engineering and mathematics essential...."

In the 20th century Earth sent probes, transmissions, and welcoming messages to the stars. Unfortunately, someone noticed. The Galactics arrived with their battle fleet in 2052. Rather than being exterminated under a barrage of hell-burners, Earth joined their vast Empire. Swearing allegiance to our distant alien overlords wasn't the only requirement for survival. We also had to have something of value to trade, something that neighboring planets would pay their hard-earned credits to buy. As most of the local worlds were too civilized to have a proper army, the only valuable service Earth could provide came in the form of soldiers....

Sergeant Gastovsky—Gas to everyone but his superior officers—never wanted to be a soldier. Far from it. But when a con goes wrong and he needs a place to lay low for a while, he finds himself wearing the power armor of the augmented infantry. After three years on a six-year contract, Gas has found his groove running low-level cons and various illegal activities that make him good money on the side. He’s the guy who can get you what you need. But he’s always had his eye out for a big score—the one that might set him up for life after the military.

It's the eve of the 22nd century: a world where the dearly departed send postcards back from Heaven and evangelicals make scientific breakthroughs by speaking in tongues; where genetically engineered vampires solve problems intractable to baseline humans. And it's all under surveillance by an alien presence. Daniel Bruks is a field biologist in a world where biology has turned computational.

In the 25th century, humankind has spread throughout the galaxy, monitored by the watchful eye of the U.N. While divisions in race, religion, and class still exist, advances in technology have redefined life itself. Now, assuming one can afford the expensive procedure, a person's consciousness can be stored in a cortical stack at the base of the brain and easily downloaded into a new body (or "sleeve") making death nothing more than a minor blip on a screen.

In AD 2600, the human race is finally beginning to realize its full potential. Hundreds of colonized planets scattered across the galaxy host a multitude of prosperous and wildly diverse cultures. Genetic engineering has pushed evolution far beyond nature's boundaries, defeating disease and producing extraordinary spaceborn creatures. Huge fleets of sentient trader starships thrive on the wealth created by the industrialization of entire star systems, and throughout inhabited space the Confederation Navy keeps the peace.

Syd Chambers grew up on Earth with his human mother and barely remembers his alien father from Denza, who left on a mission when Syd was very young. After leaving Earth, Syd learned the truth of his father’s disappearance on the planet Ashfall—his father had died protecting a devastating secret about the history between humans and Denzans.

A Red Peace, first in Spencer Ellsworth's Starfire trilogy, is an action-packed space opera in a universe where the oppressed half-Jorian crosses have risen up to supplant humanity and dominate the galaxy. Half-breed human star navigator Jaqi, working the edges of human-settled space on contract to whoever will hire her, stumbles into possession of an artifact that the leader of the Rebellion wants desperately enough to send his personal guard after. An interstellar empire and the fate of the remnant of humanity hang in the balance.

Geoff and his friends live in Phocaea, a distant asteroid colony on the Solar System's frontier. They're your basic high-spirited young adults, enjoying such pastimes as hacking matter compilers to produce dancing skeletons that prance through the low-gee communal areas, using their rocket-bikes to salvage methane ice shrapnel that flies away when the colony brings in a big (and vital) rock of the stuff, and figuring out how to avoid the ubiquitous surveillance motes.

The Ember War, book 1: The Earth is doomed. Humanity has a chance. In the near future, an alien probe arrives on Earth with a pivotal mission: to determine if humanity has what it takes to survive the impending invasion by a merciless armada. The probe discovers Marc Ibarra, a young inventor who holds the key to a daring gambit that could save a fraction of Earth's population. Humanity's only chance lies with Ibarra's ability to keep a terrible secret and engineer the planet down the narrow path to survival.

Beyond the Aquila Rift: It's shorthand for the trip no one ever hopes to make by accident. The one that will screw up the rest of your life, the one that creates the ghosts you see haunting the shadows of company bars across the whole Bubble. Men and women ripped out of time, cut adrift from families and lovers by an accident of an alien technology we use but rarely comprehend.

Passage at Arms tells the intimate, detailed and harrowing story of a climber crew and its captain during a critical juncture of the war. Cook combines speculative technology with a canny and realistic portrait of men at war and the stresses they face in combat. Passage at Arms is one of the classic novels of military science fiction.

Twelve-year-old criminal mastermind Artemis Fowl has discovered a world below ground of armed and dangerous—and extremely high-tech—fairies. He kidnaps one of them, Holly Short, and holds her for ransom in an effort to restore his family's fortune. But he may have underestimated the fairies' powers. Is he about to trigger a cross-species war?

The Earth died when aliens rained thermonuclear warheads on her cities and sprayed the surface with a bio-terminator. A deadly poison drifted to every corner of the planet, threatening the last survivors with annihilation. For a soldier like Creed, there is only one way to keep breathing untainted air. He must bury his hatred of the extraterrestrials and join the Jelk Corporation as an assault trooper, leaving the planet for outer space. In return for his and other people's services, the corporation will house the last humans for as long as the assault troopers keep winning.

Seven hundred fifty years ago, human colonists left Earth and settled on the moons of the distant gas giant Ghara. Civilization has flourished on Ghara's fertile moons, but humanity's drive to colonize and explore is still strong. Detecting plentiful mineral resources and a rich abundance of alien life on the nearby planet of Selva, the Gharian Colonists mount a dangerous expedition

The U.S.S. Merrimack was the finest battleship class spaceship in Earth's fleet, able to stand up against the best the Palatine Empire could throw at them, even able to attack and kill swarms of the seemingly unstoppable Hive. But nothing could have prepared the captain and crew of the Merrimack to face the Myriad - three colonized worlds in the midst of a globular cluster that the Hive had somehow overlooked.

Rob Dunbar is the world's best history professor. And with good reason: he's been alive for 3,000 years, keeping his existence a secret since before the days of Athens. But a stranger named Baxter has a better use for Rob's vast expertise. Baxter's looking to found a mining company in the Asteroid Belt. In exchange for Rob's help, he'll try to unravel the mystery of Rob's origin. As they're getting their outfit off the ground, they come under covert attack by HemiCo, a powerful Mars-based corporation.

Convicted criminal James Griffin-Mars is no one's hero. In his time, Earth is a toxic, abandoned world, and humans have fled into the outer solar system to survive, eking out a fragile, doomed existence among the other planets and their moons. Those responsible for delaying humanity's demise believe time travel holds the key, and they have identified James, troubled though he is, as one of a select and expendable few ideally suited for the most dangerous job in history.