Eight passengers are on the last train to Margate. It's Christmas Eve and the Southeast of England is caught in a blizzard. The train suddenly stops alongside an abandoned station. One passenger disappears, later found murdered and they discover that every one of them answered an invitation for different reasons. Joanna, a soldier, is an unexpected guest and the one factor the killer hadn't figured on. With her help, can they end this nightmare or will they become victims of their past in this frozen tomb in the dead of night?