A CIA agent is used as a pawn in an insane woman's plan to steal a Polaris submarine.
Bette Davis
as Madame Sin
Robert Wagner
as Anthony Lawrence
Denholm Elliott
as Malcolm De Vere
Gordon Jackson
as Commander Cavendish
Dudley Sutton
as Monk
Catherine Schell
as Barbara
Paul Maxwell
as Connors
David Healy
as Braden
Alan Dobie
as White
Al Mancini
as Fisherman
Paul Young
as Naval Driver
Roy Kinnear
as Holidaymaker
