Jon Keller is having breakfast in a Swiss hotel when the world ends. Another guest at the hotel receives a notification on her Twitter: Washington has been destroyed by a nuclear weapon. New York follows. Then Scotland, China, Germany. Now only twenty people remain at the hotel whilst the state of the outside world remains a mystery.
On day fifty, Jon and some of the other hotel guests find the body of a murdered girl. A historian by profession (Jon had been visiting Switzerland for an academic conference),