Cosmonaut Keep — Ken MacLeod

Matt Cairns is a 21st-century outlaw programmer who takes on the shady jobs no one else will touch. Against his better judgment, he accepts an assignment to crack the Marshall Titov, a top-secret orbital station operated by the European Space Agency. But what Matt will discover there will propel him on an extraordinary and quite unexpected journey.

Gregor Cairns is an exobiology student and descendant of one of Terra Nova's first families. Hopelessly infatuated with a lovely young trader's daughter, he is unaware that his research partner, Elizabeth, has fallen in love with him. Together, Gregor and Elizabeth confront the great work his family began three centuries earlier--to rediscover the secret of interstellar travel.

Ranging from a gritty near-future Earth to a distant alien world, Cosmonaut Keep is contemporary science fiction at its highest level, a visionary epic filled with daring individuals seeking a place for themselves in a vast, complex, and enigmatic universe.