Five hundred years after a handful of human starship travelers got lost in a hostile universe, their descendants are still struggling for survival. As hard as life is on The Raft — a platform remnant of the ship's hull — it's even harder in The Belt — a string of shacks circling the iron-rich core of a dead star. Every Belter has heard the story of the legendary starship but most of them don't believe it. But Rees, a lowly mine-rat, does. He wonders why the sky is angry red instead of the blue his parents remembered. Why food from The Raft gets less and less nutritious. Why fewer and fewer stars form every day. In his quest to find answers, Rees travels from boyhood to manhood, from the outermost edges of his world into its mysterious heart. And along the way he discovers there's more at stake than his simple curiosity: life in his enigmatic universe is about to become impossible…

A race of microscopic beings, who were genetically engineered to survive on the turbulent mantle of a neutron star and who vividly remember their superbeing creators, prepare for the biggest family reunion in history

Michael Poole’s wormholes constructed in the orbit of Jupiter had opened the galaxy to humankind. Then Poole tried looping a wormhole back on itself, tying a knot in space and ripping a hole in time. It worked. Too well. Poole was never seen again. Then from far in the future, from a time so distant that the stars themselves were dying embers, came an urgent SOS — and a promise. The universe was doomed, but humankind was not. Poole had stumbled upon an immense artifact, light-years across, fabricated from the very string of the cosmos. The universe had a door. And it was open…