Hannah wakes up to silence.
The entire city around her is empty, except for one other person: Leo. 
Stuck with only each other, they explore a world with no parents, no friends, and no school and realise that they can be themselves, instead of playing the parts everyone expects of them. 
Together, they search for answers amid crushing isolation. But while their empty world may appear harmless . . . it's not. Because nothing is quite as it seems, and if Hannah and Leo don't figure out what's going on, they might just be torn apart forever.