|John Gielgud||Edgar Brodie/Richard Ashenden|
|Madeleine Carroll||Elsa Carrington|
|Peter Lorre||The General|
|Robert Young||Robert Marvin|
|Florence Kahn||Mrs. Caypor|
|Michael Redgrave||Army captain (uncredited)|
British intelligence fakes the death of Edgar Brodie to send him on a mission in Switzerland, where as Richard Ashendon he is to locate and kill a Germany spy. Accompanying Brodie are fellow agents Elsa Carrington, who is to play Brodie's wife, and an eccentric assassin known as The General . Locating the spy on a train, Brodie and Elsa have second thoughts about their mission just as an American ingratiates himself with them.