Ryland Grace is the sole survivor on a desperate, last-chance missionand if he fails, humanity and the earth itself will perish. Except that right now, he doesnt know that. He cant even remember his own name, let alone the nature of his assignment or how to complete it. All he knows is that hes been asleep for a very, very long time. And hes just been awakened to find himself millions of miles from home, with nothing but two corpses for company. His crewmates dead, his memories fuzzily returning, Ryland realizes that an impossible task now confronts him. Hurtling through space on this tiny ship, its up to him to puzzle out an impossible scientific mysteryand conquer an extinction-level threat to our species. And with the clock ticking down and the nearest human being light-years away, hes got to do it all alone. Or does he? An irresistible interstellar adventure as only Andy Weir could deliver, Project Hail Mary is a tale of discovery, speculation, and survival to rival The Martianwhile taking us to places it never dreamed of going.