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.

2080: at a remote site on the edge of the Arctic Circle, a group of scientists, engineers, and physicians gather to gamble humanity’s future on one last-ditch experiment. Their goal: to make a tiny alteration to the past, averting a global catastrophe while at the same time leaving recorded history intact. To make the experiment work, they just need one last recruit: an ageing schoolteacher whose late mother was the foremost expert on the mathematics of paradox.

To win an impossible war, Captain Kel Cheris must awaken an ancient weapon and a despised traitor general.

Captain Kel Cheris of the Hexarchate is disgraced for using unconventional methods in a battle against heretics. Kel Command gives her the opportunity to redeem herself by retaking the Fortress of Scattered Needles, a star fortress that has recently been captured by heretics. Cheris' career isn't the only thing at stake. If the fortress falls, the Hexarchate itself might be next.

Men had built cities before, but never such a city as Diaspar; for millennia its protective dome shut out the creeping decay and danger of the world outside. Once, it ruled the stars. But then, as legend had it, the Invaders came, driving humanity into this last refuge. It takes one man, a Unique, to smash the legend and discover the true nature of the Invaders.

This is the way the world ends...for the last time. It starts with the great red rift across the heart of the world's sole continent, spewing ash that blots out the sun. It starts with death, with a murdered son and a missing daughter. It starts with betrayal, and long dormant wounds rising up to fester. This is the Stillness, a land long familiar with catastrophe, where the power of the earth is wielded as a weapon. And where there is no mercy.

Red Schuhart is a stalker, one of those young rebels who are compelled, in spite of extreme danger, to venture illegally into the Zone to collect the mysterious artifacts that the alien visitors left scattered around. His life is dominated by the place and the thriving black market in the alien products. But when he and his friend Kirill go into the Zone together to pick up a "full empty", something goes wrong.

This is Brian Aldiss' first novel, a story of a small tribe in a very strange jungle, who make unsettling discoveries about the nature of their world. Non-Stop (published in the US as Starship) is the classic SF novel of discovery and exploration, a brilliant evocation of a familiar setting seen through the eyes of a primitive.

Our universe is ruled by physics, and faster-than-light travel is not possible - until the discovery of The Flow, an extradimensional field we can access at certain points in space-time that transports us to other worlds, around other stars. Humanity flows away from Earth, into space, and in time forgets our home world and creates a new empire, the Interdependency, whose ethos requires that no one human outpost can survive without the others. It's a hedge against interstellar war - and a system of control for the rulers of the empire.

When the silent spacecraft arrived and took the light from the world, no one knew what to expect. When the Overlords finally showed themselves it was a shock but one that humankind could now cope with, and an era of peace, prosperity and endless leisure began. But the children of this utopia dream strange dreams of distant suns and alien planets, and soon they will be ready to join the Overmind...and, in a grand and thrilling metaphysical climax, leave Earth behind.

Random House presents the audiobook edition of Killing Floor by Lee Child, read by Jeff Harding. Killing Floor is the first book in the internationally popular Jack Reacher series. It presents Reacher for the first time, as the tough ex-military cop of no fixed abode: a righter of wrongs, the perfect action hero. Jack Reacher jumps off a bus and walks 14 miles down a country road into Margrave, Georgia. An arbitrary decision he's about to regret.

The spectacular debut novel nominated for every major science fiction award in 2014, Ancillary Justice is the story of a warship trapped in a human body and her search for revenge. Winner of the Arthur C. Clarke Award, the Nebula Award, the British Science Fiction Association Award, a James Tiptree Jr. honour and a Kitschie. Currently shortlisted for the Hugo Awards. They made me kill thousands, but I only have one target now.

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....

Shevek is brilliant scientist who is attempting to find a new theory of time - but there are those who are jealous of his work, and will do anything to block him. So he leaves his homeland, hoping to find a place of more liberty and tolerance. Initially feted, Shevek soon finds himself being used as a pawn in a deadly political game. With powerful themes of freedom, society and the natural world's influence on competition and co-operation, The Dispossessed is a true classic of the 20th century.

Young Lerris is dissatisfied with his life and trade, and yearns to find a place in the world better suited to his skills and temperament. But in Recluce a change in circumstances means taking one of two options: permanent exile from Recluce or braving the dangergeld, a complex, rule-laden wanderjahr in the lands beyond Recluce, with the aim of learning how the world works and what his place in it might be. Many do not survive. Lerris chooses the dangergeld.

Ensign Andrew Dahl has just been assigned to the Universal Union Capital Ship Intrepid, flagship of the Universal Union since the year 2456. Life couldn’t be better…until Andrew begins to pick up on the facts that (1) every Away Mission involves some kind of lethal confrontation with alien forces; (2) the ship’s captain, its chief science officer, and the handsome Lieutenant Kerensky always survive these confrontations; and (3) at least one low-ranked crew member is, sadly, always killed.