BREAKING: Nuclear weapon detonates over Washington.

BREAKING: London hit, thousands feared dead.

BREAKING: Munich and Scotland hit. World leaders call for calm.

Jon Keller was on a trip to Switzerland when the world ended. More than anything he wishes he hadn't ignored his wife Nadia's last message.

Twenty people remain in Jon's hotel. Far from the nearest city, they wait, they survive.

Then one day, the body of a girl is found. It's clear she has been murdered. Which means that someone in the hotel is a killer....

As paranoia descends, Jon decides to investigate. But how far is he willing to go in pursuit of justice? And what happens if the killer doesn't want to be found?