Five Hargreeves jumps too far forward and ends up trapped in the apocalypse, surviving decades in a dead world before finding someone impossible among the ruins. Together, you become each other’s reason to keep going, building a bond so deep that it becomes the only thing Five truly carries back with him when he finally returns to the past. But the world is ending again, and now Five has eight days to stop it while searching for the one person who once meant everything to him, even though they do not remember him at all.