Aliens are spying on Earth from one of the four worlds that make up the Warden Diamond. But it is impossible to send agents to any of the four worlds because of unique microscopic symbionts that make it impossible for visitors to leave the Diamond. Seeking a unique solution, each of the four worlds making up the Diamond is sent a person whose mind has been stripped of everything and who is now controlled by an agent of the Confederacy. Lilith is the first planet to be visited.

On the technological, decadent world of Proton, someone was trying to destroy Stile, serf and master Gamesman. His only escape lay in Phaze, a world totally ruled by magic. Soon he learned that his alternate self had already been murdered, and that he was next. On Proton, his fate depended on winning the great Games. On Phaze, he must master magic to survive. And if he used any magic at all, his friends were determined to kill him at once!

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....

Welcome to Ringworld, an intermediate step between Dyson Spheres and planets. The gravitational force created by a rotation on its axis of 770 miles per second means no need for a roof. Walls 1,000 miles high at each rim will let in the sun and prevent much air from escaping. Larry Niven's novel, Ringworld, is the winner of the 1970 Hugo Award for Best Novel, the 1970 Nebula Award for Best Novel, and the 1972 Ditmars, an Australian award for Best International Science Fiction.

This is a spellbinding tale woven of equal parts epic and myth - with a liberal dash of hard science fiction. When a one-way time tunnel to Earth’s distant past, specifically six million B.C., was discovered by folks on the Galactic Milieu, every misfit for light-years around hurried to pass through it. Each sought his own brand of happiness. But none could have guessed what awaited them. Not even in a million years....

What happens to the would-be peacemakers when they find themselves in the middle of something else? Something dangerous, something highly advanced...and something familiar? If humanity is wise, we will prepare for everything we can imagine. But we cannot prepare for what we cannot imagine. It might be benign, it might be malign, or it might be a sign. You just have to know where to look.

What would you do if you found a spaceship? Would you call the government, would you pretend you never saw it, or would you keep it a secret? What would you do with it? Use it to gallivant around the galaxy, conquer Earth, get filthy rich, or try to improve life on Earth? Listen along and find out how Marc works to convert Earth into a spacefaring world capable of defending itself and of being united as it meets the other civilizations in the galaxy.

Amber is the one real world, of which all others including our own Earth are but Shadows. Amber burns in Corwin's blood. Exiled on Shadow Earth for centuries, the prince is about to return to Amber to make a mad and desperate rush upon the throne.

For millennia, the Weave, an alliance of species, have fought to resist the telepathic Amplitur, who strive to unite all self-aware life-forms in their great "Purpose." The Weave is slowly losing ground, but for both sides, warfare focuses more on outthinking and outmaneuvering your foe than destruction. In fact, most regard violence as hideously barbaric, and even the thought of harming another sentient being is beyond imagining.

For a thousand years the ash fell and no flowers bloomed. For a thousand years the Skaa slaved in misery and lived in fear. For a thousand years the Lord Ruler, the "Sliver of Infinity," reigned with absolute power and ultimate terror, divinely invincible. Then, when hope was so long lost that not even its memory remained, a terribly scarred, heart-broken half-Skaa rediscovered it in the depths of the Lord Ruler's most hellish prison.

The wickedest, most wonderful science fiction story ever created in our - or any - time. Anything can begin at a party in California - and everything does in this bold masterwork by a grand master of science fiction. When four supremely sensual and unspeakably cerebral humans - two male, two female - find themselves under attack from aliens who want their awesome quantum breakthrough, they take to the skies - and zoom into the cosmos on a rocket roller-coaster ride of adventure, danger, ecstasy, and peril.

There's a reason We Are Legion was named Audible's Best Science Fiction Book of 2016: Its irresistibly irreverent wit! Bob Johansson has just sold his software company for a small fortune and is looking forward to a life of leisure. The first item on his to-do list: Spending his newfound windfall. On an urge to splurge, he signs up to have his head cryogenically preserved in case of death. Then he gets himself killed crossing the street. Waking up 117 years later, Bob discovers his mind has been uploaded into a sentient space probe with the ability to replicate itself.

You ever have one of those days? U.S. Marine Sergeant Jake Bayard did when he has to cancel a hot date to board a transport plane to the South Pole, which is hijacked by aliens with hostile intent to Earth. Bayard escapes into tunnels deep under the ice and stumbles upon advanced technology that teleports him to Epsilon Eridani. Desperately alone and on the run, Bayard falls back onto his combat training, soon discovering that these aliens keep human herds for meat. That’s it. He enlists some of the downtrodden and declares war against the hungry oppressors.

Hadrian Blackwater, a warrior with nothing to fight for, is paired with Royce Melborn, a thieving assassin with nothing to lose. Hired by an old wizard, they must steal a treasure that no one can reach. The Crown Tower is the impregnable remains of the grandest fortress ever built and home to the realm’s most prized possessions. But it isn’t gold or jewels that the wizard is after, and if he can just keep them from killing each other, they just might succeed.

Tricked into a world of banished gods, demons, goblins, sprites and magic, Richter must learn to meet the perils of The Land and begin to forge his own kingdom. Actions have consequences across The Land, with powerful creatures and factions now hell-bent on Richter's destruction. Can Richter forge allegiances to survive this harsh and unforgiving world or will he fall to the dark denizens of this ancient and unforgiving realm? A tale to shake "The Land" itself, measuring 10/10 on the Richter scale, how will Richter's choices shape the future of The Land and all who reside in it?

"Triplanetary" is a science fiction novel by E. E. Smith. The novel covers several episodes in an eons-long human breeding project by the super-intelligences of the Arisians. This alien race is breeding two genetic lines to become the ultimate weapon in Arisia's cosmic war with their archenemies, the Eddorians. The story cover the Kinnison genetic line during the fall of Atlantis, Nero's reign in Rome, World Wars One, Two, and Three.

A thousand years ago, an alien invasion set humanity back to the Iron Age. Slowly, we recovered, colonizing the Solar System in peace. And discovered that an unknown force is stopping us from exploring any farther. But before the cause can be discovered, a slow-burning conspiracy threatens to explode into System-wide war. With enemies at home and in the darkness beyond, a team of unlikely heroes-a janitor, a mercenary, an asteroid miner, and a pirate-are the only ones who can avert a second apocalypse. This set includes the first three books of the newly-finished REBEL STARS series.

From birth to death, The War is all the citizens of Dystance know. As children it is drilled into their heads that war is the purpose behind all existence. Winter doesn't agree. She's stumbled across remnants of life the way it was before The War began, and now she longs to be as free as her ancestors. With help from her best friend Cedar and the boy she is forbidden to love, Tallow. She believes she can do it. Winter can see a life beyond the Pickets, beyond the constant hunger and the threat of death, beyond the war machine.

Late in the 21st century, Earth receives what looks like an urgent plea for help from planet Proxima Centauri b in the closest star system to the Sun. Astrophysicists suspect a massive solar flare is about to destroy this heretofore-unknown civilization. Earth's space programs are unequipped to help, but an unscrupulous Russian billionaire launches a secret and highly-specialized spaceship to Proxima b, over four light-years away.

The Peacemaker-enforced ceasefire brought an end to the hostilities, but not a resolution, and now it’s up to the Four Horsemen to forge a lasting peace. Alexis Cromwell, despite her pregnancy, heads off to Capital with Nigel Shirazi to obtain justice from the enigmatic Mercenary Guild Council, but when they arrive, they’re quickly embroiled in galactic politics, and find out the situation is far, far worse than they could possibly have imagined.

When a mine owner thinks that he's above the law and continues to utilize slave labor to keep his mines running, Barnabas, a former Ranger One, must fight for justice.

When the biggest colony ship in human history was sent to settle a paradise world, an accident hurtled it deep into uncharted space. A thousand light years from Earth, with no way home and no way to call for help, the colonists’ only hope for survival was the one barely habitable planet in range, a nightmare world they named Croatoan. Landing on the only five mountain peaks tall enough to rise above the lethal acid clouds, the settlers carved a civilization from the rock.

A huge international corporation has developed a facility along the Juan de Fuca Ridge at the bottom of the Pacific Ocean to exploit geothermal power. They send a bio-engineered crew - people who have been altered to withstand the pressure and breathe the seawater - down to live and work in this weird, fertile undersea darkness.

NASA finally made it. The very first human has just set foot on the surface of our neighbor planet. This is the start of a long research expedition that sent four scientists into space. But the four astronauts of the NASA crew are not the only ones with this destination. The privately financed "Mars for Everyone" initiative has also targeted the Red Planet. Twenty men and women have been selected to live there and establish the first extraterrestrial settlement.

A world with no hunger, no disease, no war, no misery: Humanity has conquered all those things and has even conquered death. Now Scythes are the only ones who can end life - and they are commanded to do so in order to keep the size of the population under control. Citra and Rowan are chosen to apprentice to a scythe - a role that neither wants. These teens must master the "art" of taking life, knowing that the consequence of failure could mean losing their own.

It is the second stage of human colonization - the first age, humanity's initial attempt to people the stars, ended in disaster when it was discovered that Earth's original superluminal drive did permanent genetic damage to all who used it - mutating Earth's far-flung colonists in mind and body. Now, one of Earth's first colonies has given humanity back the stars, but at a high price - a monopoly over all human commerce.

Higgens has the best job in the galaxy. Except for the fact that he’s technically a janitor on a galactic mining vessel. When he discovers an unknown alien species, his world gets turned upside down. He will have to find unlikely allies if he is going to save his new friend and help her build a new home. The Mimic and the Space Engineer boxed set contains the first three books in the Space Shifter Chronicles. If you like fast-paced space adventures with engaging, and quirky, characters, you will love Higgens, Mimic, and their adventures in space.

Any kind of death annuls everything except his present knowledge and returns him to the past. This is a good way to test all sorts of things. That is, it would be, if not for one little thing.... This loop has real lords and it's unlikely that they'll be happy to hear about an uninvited guest. And that isn't his only problem - all of his memories of the last year have simply disappeared, but the world around him has changed in the meantime.

On the run and out of chances, he guides his ship and crew into the heart of a relic older than the galaxy itself - and find himself on the edge of an eternal war he never knew existed. The relic is a mech, lost to history and forgotten by all who remain. Built by an ancient race to be the ultimate weapon, the machine is capable of unspeakable destruction, and its discovery could unhinge the balance of power throughout known space.

When prospector Bob Broadhead went out to Gateway on the Heechee spacecraft, he decided he would know which was the right mission to make him his fortune. Three missions later, now famous and permanently rich, Robinette Broadhead has to face what happened to him and what he is...in a journey into himself as perilous and even more horrifying than the nightmare trip through the interstellar void that he drove himself to take!