The plane carrying diplomat Sir Stafford Nye, returning to England, makes an emergency landing at Frankfurt Airport due to bad weather. In the transit lounge, Nye encounters a young woman who asks him for help. She says her life is in danger and asks Stafford to give her his coat, ticket, and passport so she can board the plane to London. For some unknown reason, the diplomat agrees to this gamble. But in vain. Very soon, Sir Nye discovers he has been drawn into an international conspiracy, and it is his life that is in danger…