A police captain poses as the valet of a friend who has been invited on a yacht cruise by a notorious schemer, whom the friend is afraid wants to murder him.
as Capt. Roger Peel
as Sylvia Paget
as Vernon Wolfe
as Captain MacDonnell
as Arthur Wardell
as Count Boris Ivanoff
as Dr. Saunders
as Countess Olga Karova
as Nigel Menzies
as Colonel Paget
as Lisette - Maid
