In the near future of Robert Charles Wilson's Last Year, the technology exists to open doorways into the past - but not our past, not exactly. Each "past" is effectively an alternate world, identical to ours but only up to the date on which we access it. And a given "past" can be reached only once. After a passageway is open, it's the only road to that particular past; once closed, it can't be reopened.

Cassie Klyne, 19 years old, lives in the United States in the year 2015 - but it's not our United States, and it's not our 2015. Cassies world has been at peace since the Great Armistice of 1918. There was no World War II, no Great Depression. Poverty is declining, prosperity is increasing everywhere; social instability is rare. But Cassie knows the world isn't what it seems. Her parents were part of a group who gradually discovered the awful truth: That for decades - back to the dawn of radio communications - human progress has been interfered with, made more peaceful and benign, by an extraterrestrial entity.

In our rapidly-changing world of "social media", everyday people are more and more able to sort themselves into social groups based on finer and finer criteria. In the near future of Robert Charles Wilson's The Affinities, this process is supercharged by new analytic technologies - genetic, brain-mapping, behavioral.

Inheriting your uncle's supervillain business is more complicated than you might think. Particularly when you discover who's running the place. Charlie's life is going nowhere fast. A divorced substitute teacher living with his cat in a house his siblings want to sell, all he wants is to open a pub downtown, if only the bank will approve his loan. Then his long-lost uncle Jake dies and leaves his supervillain business (complete with island volcano lair) to Charlie. But becoming a supervillain isn't all giant laser death rays and lava pits.

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.

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.

A catastrophic event renders the earth a ticking time bomb. In a feverish race against the inevitable, nations around the globe band together to devise an ambitious plan to ensure the survival of humanity far beyond our atmosphere, in outer space.

Lynesse is the lowly Fourth Daughter of the queen, and always getting in the way. But a demon is terrorizing the land, and now she's an adult (albeit barely) with responsibilities (she tells herself). Although she still gets in the way, she understands that the only way to save her people is to invoke the pact between her family and the Elder sorcerer who has inhabited the local tower for as long as her people have lived here (though none in living memory has approached it).

Dr. Tyson Klein is a quantum physicist who has dedicated his entire life to his research. At CERN, he analyses data generated by the Large Hadron Collider, the world's biggest and most powerful particle accelerator. Now, Ty believes he's found a pattern in its output. It looks like an organised data stream, being broadcast over what he calls a quantum radio. Could it be a signal from another universe? A message sent from the future? Or something else entirely?

When an experiment to study quantum uncertainty goes spectacularly wrong, physics student Bill Rustad and his friends find that they have accidentally created an inter-dimensional portal. They connect to Outland - an alternate Earth with identical geology, but where humans never evolved. The group races to establish control of the portal before the government, the military, or evildoers can take it away. Then everything changes when the Yellowstone supervolcano erupts in an explosion large enough to destroy civilization and kill half the planet.

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".

Nine hundred thousand years ago, something annihilated the Amarantin civilization just as it was on the verge of discovering space flight. Now one scientist, Dan Sylveste, will stop at nothing to solve the Amarantin riddle before ancient history repeats itself. With no other resources at his disposal, Sylveste forges a dangerous alliance with the cyborg crew of the starship Nostalgia for Infinity. But as he closes in on the secret, a killer closes in on him because the Amarantin were destroyed for a reason.

Marooned in outer space after an attack on his ship, Nomad, Gulliver Foyle lives to obsessively pursue the crew of a rescue vessel that had intended to leave him to die.

Six million years ago, at the very dawn of the starfaring era, Abigail Gentian fractured herself into a thousand male and female clones: the shatterlings. Sent out into the galaxy, these shatterlings have stood aloof as they document the rise and fall of countless human empires. They meet every 200,000 years to exchange news and memories of their travels with their siblings.

The sun is bloated, diseased, dying perhaps. Beneath its baneful light, Shadrapar, last of all cities, harbours fewer than 100,000 human souls. Built on the ruins of countless civilisations, Shadrapar is a museum, a midden, an asylum, a prison on a world that is ever more alien to humanity. Bearing witness to the desperate struggle for existence between life old and new is Stefan Advani: rebel, outlaw, prisoner, survivor.

Lise Adams is a young woman attempting to uncover the mystery of her father's disappearance ten years earlier. Turk Findley is an ex-sailor and sometimes-drifter. They come together when an infall of cometary dust seeds the planet with tiny remnant Hypothetical machines. Soon, this seemingly hospitable world will become very alien indeed--as the nature of time is once again twisted, by entities unknown.

Scott Warden is a man haunted by the past-and soon to be haunted by the future. In early 21st-century Thailand, Scott is an expatriate slacker. Then, one day, he inadvertently witnesses an impossible event: the violent appearance of a 200-foot stone pillar in the forested interior. Its arrival collapses trees for a quarter mile around its base, freezing ice out of the air and emitting a burst of ionizing radiation. It appears to be composed of an exotic form of matter.

In 1912, history was changed by the Miracle, when the old world of Europe was replaced by Darwinia, a strange land of nightmarish jungle and antediluvian monsters. To some, the Miracle was an act of divine retribution; to others, it is an opportunity to carve out a new empire. Leaving an America now ruled by religious fundamentalists, young Guilford Law travels to Darwinia on a mission of discovery that will take him further than he can possibly imagine.

In the reign of President Deklan Comstock, a reborn United States is struggling back to prosperity. Over a century after the Efflorescence of Oil, after the Fall of the Cities, after the Plague of Infertility, after the False Tribulation, after the days of the Pious Presidents, the sixty stars and thirteen stripes wave from the plains of Athabaska to the national capital in New York City. In Colorado Springs, the Dominion sees to the nation's spiritual needs.

In this prequel to Eon, Greg Bear continues to explore the possibilities presented by the asteroid Thistledown, a remnant of a lost human civilization. The Way is a tunnel through space and time that leads to other worlds, some more like planet Earth than Earth itself. It is perhaps the most formidable discovery in Thistledown and with it come disputes as to the nature of the Way and how it should be used. The Way can be reached only through Axis City, the only space station of Thistledown.