The Mote In God's Eye is their acknowledged masterpiece, an epic novel of mankind's first encounter with alien life that transcends the genre. No lesser an authority than Robert A. Heinlein called it "possibly the finest science fiction novel I have ever read".

The gigantic comet had slammed into Earth, forging earthquakes a thousand times too powerful to measure on the Richter scale, tidal waves thousands of feet high. Cities were turned into oceans; oceans turned into steam. It was the beginning of a new Ice Age and the end of civilization. But for the terrified men and women chance had saved, it was also the dawn of a new struggle for survival--a struggle more dangerous and challenging than any they had ever known....

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.

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.

They mustn't harm a human being, they must obey human orders, and they must protect their own existence...but only so long as that doesn't violate rules one and two. With these Three Laws of Robotics, humanity embarked on a bold new era of evolution that would open up enormous possibilities, and unforeseen risks.

Best-selling science fiction superstars Larry Niven and Jerry Pournelle combine their talents with those of Steven Barnes in an extraordinary adventure of humankind’s first outpost in the farthest reaches of space. Light years from Earth, colonists land on a planet they name Avalon. It seems like a paradise—until native creatures savagely attack. It will take every bit of intelligence, courage, and military-style discipline to survive.

From the Audie-nominated narrator of The Martian. In eleven years' time, a million members of an alien race will arrive at Earth. Years before they enter orbit, their approach will be announced by the flare of a thousand flames in the sky, their ships' huge engines burning hard to slow them from the vast speeds needed to cross interstellar space. These foreboding lights will shine in our night sky like new stars, getting ever brighter until they outshine even the sun, casting ominous shadows and banishing the night until they suddenly blink out.

In what is considered one of Heinlein's most hair-raising, thought-provoking, and outrageous adventures, the master of modern science fiction tells the strange story of an even stranger world. It is 21st-century Luna, a harsh penal colony where a revolt is plotted between a bashful computer and a ragtag collection of maverick humans, a revolt that goes beautifully until the inevitable happens. But that's the problem with the inevitable: it always happens.

The Shadow of the Torturer is the first volume in the four-volume epic, the tale of a young Severian, an apprentice to the Guild of Torturers on the world called Urth, exiled for committing the ultimate sin of his profession - showing mercy towards his victim.

Gene Wolfe's "The Book of the New Sun" is one of speculative fiction's most-honored series. In a 1998 poll, Locus Magazine rated the series behind only "The Lord of the Rings" and The Hobbit as the greatest fantasy work of all time.

Stranger in a Strange Land is the epic saga of an earthling, Valentine Michael Smith, born and educated on Mars, who arrives on our planet with “psi” powers—telepathy, clairvoyance, precognition, telekinesis, teleportation, pyrolysis, and the ability to take control of the minds of others—and complete innocence regarding the mores of man. After his tutelage under a surrogate father figure, Valentine begins his transformation into a kind of messiah.