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Babel-17
by Samuel R. Delany (1966)

Humanity, which has spread throughout the universe, is involved in a war with the Invaders, who have been covertly assassinating officials and sabotaging spaceships. The only clues humanity has to go on are strange alien messages that have been intercepted in space. Poet and linguist Rydra Wong is determined to understand the language and stop the alien threat.

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Sundiver [S1]
by David Brin (1980)

In all the universe, no species reached for the stars without "uplift" guidance, except possibly humankind. It could be that some cryptic patron race began the job long ago, then abandoned us. Or we may have leaped all by ourselves. That question burns, yet a greater mystery looms ahead, in the furnace of a star. Expedition Sundiver prepares for the most momentous voyage in our history.

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Eon [S1]
by Greg Bear (1985)

The 21st century was on the brink of nuclear war when the 300 kilometer-long stone flashed out of nothingness and into Earth's orbit. NASA, NATO, and the UN sent explorers to the asteroid's surface... and discovered marvels and mysteries to drive researchers mad. For the Stone was from space, and within the hollowed asteroid was Thistledown... the remains of a vanished civilisation.

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Sphere
by Michael Crichton (1987)

A group of American scientists are rushed to a huge vessel that has been discovered resting on the ocean floor in the middle of the South Pacific. What they find defies their imaginations and mocks their attempts at logical explanation. It is a spaceship of phenomenal dimensions... apparently undamaged by its fall from the sky. And it appears to be at least 300 years old.

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Pattern Recognition [S1]
by William Gibson (2003)

Cayce Pollard is an expensive, spookily intuitive market-research consultant. In London on a job, she is offered a secret assignment investigating some intriguing snippets of video that have been appearing on the Internet. An entire subculture of people is obsessed with these bits of footage, and anybody who can create that kind of brand loyalty would be a gold mine for Cayce's client.

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The Algebraist
by Iain M. Banks (2004)

It is 4034 AD. Seconded to a military-religious order he's barely heard of, Fassin Taak must travel amongst the Dwellers of the gas giant Nasqueron, in search of a secret hidden for half a billion years. Any help they offer will be on their own terms and in their own time. But time is one thing Fassin Taak doesn't have, with each passing day bringing the system closer to war.

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Pandora's Star [S1]
by Peter F. Hamilton (2004)

By the 24th century Earth is the centre of the colonial-style Intersolar Commonwealth, made possible by the discovery of wormhole travel. When the stars 2000 light years in the distance known as the Dyson Pair disappear, a faster-than-light ship is needed to investigate. Opposed to the mission are a cult that believes the human race is being manipulated by an alien entity.

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Pushing Ice
by Alastair Reynolds (2005)

In 2057, Bella Lind and the crew of her nuclear-powered ship, the Rockhopper, push ice... they mine comets. But when Janus, one of Saturn's ice moons, inexplicably leaves its natural orbit and heads out of the solar system at high speed, Bella is ordered to shadow it for the few vital days before it falls forever out of reach. Janus has some unwelcome surprises in store.

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Dark Matter
by Blake Crouch (2016)

Physics professor Jason Dessen is walking home through the chilly Chicago streets one night when a man in a mask kidnapps him at gunpoint, for reasons he can’t begin to fathom. His abductor injects him with some unknown drug and he loses consciousness. When Jason awakes, he soon learns that the world he’s woken up to is not the one he left. And someone is hunting him.

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The Echo Wife
by Sarah Gailey (2021)

Martine is a genetically cloned replica made from Evelyn Caldwell’s award-winning research. She’s patient, gentle and obedient. She’s everything Evelyn swore she’d never be... and she’s having an affair with Evelyn’s husband. Now, the cheating bastard is dead and a mess to clean up. Cosmopolitan notes "The Echo Wife puts a fresh sci-fi twist to a well-worn dramatic story."