When a corpse is found in the Thames, the only clue is that the dead man was killed by a karate or judo expert.
Superintendent Wills
Dr. Nelson Pollard
Elsa Marlowe
Lock-Keeper
Dr. Maurice Tarn
Honeymoon Wife
Det. Sgt. Stillman
Major Paul Amery
Clerk
Johnny Choto
Mr. Nam Lee
Miss Russell
Mitch Hallam
Angus
Soyoki
Pathologist
Vera Martin
Joe Martin
Tamaya
Lock-keeper's Assistant
1st Chinese Man
2nd Chinese Man
Captain Feng
Honeymoon Husband
Police Sgt.
Warden
Reporter
Uniformed Sgt.
Police Constable
Instructor in Gym
