Jon thought he had all the time in the world to respond to his wife’s text message: I miss you so much. I feel bad about how we left it. Love you. But as he’s waiting in the lobby of his hotel in Switzerland, he receives a string of horrifying push notifications. Washington, DC has been hit with a nuclear bomb, followed by New York, then London and finally Berlin. Two months later, there are 20 survivors holed up at the hotel, a place already tainted by its strange history of suicides and murders. Jon and the rest try to maintain some semblance of civilization. But when he goes up to the roof to investigate the hotel’s worsening water quality, he is shocked to discover the body of a young girl floating in one of the tanks. As supplies dwindle and tensions rise, Jon becomes obsessed with discovering the truth behind the girl’s death.