When a corpse is found in the Thames, the only clue is that the dead man was killed by a karate or judo expert.
John Bentley
Superintendent Wills
Patrick Allen
Dr. Nelson Pollard
Jacqueline Ellis
Elsa Marlowe
Wilfrid Brambell
Lock-Keeper
John Glyn-Jones
Dr. Maurice Tarn
Jane Murdoch
Honeymoon Wife
Brian McDermott
Det. Sgt. Stillman
Gerald Andersen
Major Paul Amery
Edward Atienza
Clerk
Ric Young
Johnny Choto