From the #1 New York Times bestselling author of Anathem, Reamde, and Cryptonomicon comes an exciting and thought-provoking hard science fiction epic—a grand story of annihilation and survival spanning five thousand years.

What would happen if the world were ending?

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 a hastily built space ark.

But the complexities and unpredictability of human nature coupled with unforeseen challenges threaten the intrepid pioneers, turning their mission into a desperate survival story until only a handful of survivors remain . . .

Five thousand years later, their progeny—seven distinct races now three billion strong—embark on yet another audacious post-apocalyptic journey into the unknown . . . to an alien world utterly transformed by cataclysm and time: Earth.

A writer of dazzling genius and imaginative vision, Neal Stephenson combines science, philosophy, technology, psychology, and literature in a magnificent work of speculative fiction that offers a portrait of a future that is both extraordinary and eerily recognizable. As he did in Anathem, Cryptonomicon, the Baroque Cycle, and Reamde, Stephenson explores some of our biggest ideas and perplexing challenges in a breathtaking saga that is daring, engrossing, and altogether brilliant.