Joe Barton (George Raft) is an American intelligence agent working an undercover mission in Turkey during World War II. Turkey is neutral territory, but the Nazis are developing plans to take control of the country. A strange woman passes Barton papers containing details of a supposed Soviet invasion. Also very interested in the documents are a mysterious Russian operative, Tamara Zaleshoff (Brenda Marshall), and traitorous Nazi agent Colonel Robinson (Sydney Greenstreet).