When John North, a budding author, pulls the communication cord of a late night train that is taking him away on a weekend with his publishers wife, he sets in motion a series of events that lead to a train crash, a murder and a police man hunt, but all is not what it seems.

A Royal navy Commander is tricked by a pretty girl who is working for the Nazis. She tricks him into revealing some military secrets and he is court martial. He vows to track her and her accomplices down.