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!

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.

Thomas Covenant is a leper, a bitter and solitary pariah who is mystically transported to another Earth where time moves differently than ours, one in which magic takes many forms. The Land is threatened by many evils, the most immediate of which is a maddened Cavewight whose subterranean excavations have unearthed the ancient and puissant Staff of Law. More dangerous to the free people of the Land is the Gray Slayer, Lord Foul, the Despiser, who intends to destroy the actual foundations of the Earth that he might wage war against the universe’s creator.

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.

In this, the first novel of the best-selling Incarnations of Immortality series, Piers Anthony combines a deeply moving examination of the meaning of life and death with a gripping story of romance and loyalty, all set in a world of magic and technical wizardry.

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.

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....

Skeeve is a magician’s apprentice (and a wanna-be thief) until an assassin’s bolt kills his master, Garkin. Along with Aahz, the green-scaled, purple-tongued demon and master magician summoned by Garkin, he sets out on a quest to get even. The road to vengeance is bound to prove rocky, however, because Skeeve can barely light a candle with his beginning magic, and Aahz has lost his own considerable magical abilities as a consequence of Garkin’s summoning spell.

After his little sister vanishes before his eyes, Kellen awakens in another realm inhabited by mythical creatures and people who shape the very forces of nature. These are the Beastcallers, wielders of elemental magics who ascend alongside their beast companions.

Friday, a secret courier, is thrown into an assignment under the command of her employer, a man she knows only as "Boss." She operates from and over a near-future Earth in North America, a vulgar and chaotic land comprised of dozens of independent states. In America's disunion, Friday keeps her balance nimbly with quick, expeditious solutions as she conquers one calamity and scrape after another.

Adrian Tchaikovksy's critically acclaimed stand-alone novel Children of Time is the epic story of humanity's battle for survival on a terraformed planet. Who will inherit this new Earth? The last remnants of the human race left a dying Earth, desperate to find a new home among the stars. Following in the footsteps of their ancestors, they discover the greatest treasure of the past age - a world terraformed and prepared for human life. But all is not right in this new Eden.

When Lenina and Bernard visit a savage reservation, we experience how Utopia can destroy humanity. Cloning, feel-good drugs, anti-aging programs, and total social control through politics, programming, and media: has Aldous Huxley accurately predicted our future? With a storyteller's genius, he weaves these ethical controversies in a compelling narrative that dawns in the year 632 A.F. (After Ford, the deity). When Lenina and Bernard visit a savage reservation, we experience how Utopia can destroy humanity.

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.

There are some odd things about Nate’s new apartment. Of course, he has other things on his mind. He hates his job. He has no money in the bank. No girlfriend. No plans for the future. So while his new home isn’t perfect, it’s livable. The rent is low, the property managers are friendly, and the odd little mysteries don’t nag at him too much. At least, not until he meets Mandy, his neighbor across the hall, and notices something unusual about her apartment. And Xela’s apartment. And Tim’s. And Veek’s.