A socialite poses as a Nazi spy to mask her activities as a British agent.
Anna Neagle
as Sally Maitland
Richard Greene
as Lieutenant Commander Jim Garrick
Nova Pilbeam
as Betty Maitland
Albert Lieven
as Jan Orlock
Lucie Mannheim
as Madame Orlock
George Thorpe
as Colonel Charles Hargraves
Marjorie Fielding
as Lady Maitland
Franklin Dyall
as Captain Foster
Margaret Rutherford
as Mrs. Towcester
Claude Bailey
as Major Fothergill
Valentine Dyall
as German Commander
Sybille Binder
as Madame Orlock's Attendant
