Projekt Hail Mary

"A lone astronaut. An impossible mission. An ally he never imagined. Ryland Grace is the sole survivor on a desperate, last-chance mission--and if he fails, humanity and Earth itself will perish. Except that right now, he doesn't know that. He can't even remember his own name, let alone the nature of his assignment or how to complete it. All he knows is that he's been asleep for a very, very long…