Scotland Yard is after a homicidal maniac called The Blue Hand, which is what he uses to kill his victims.
Inspektor Craig
Dave Emerson / Richard Emerson
Dr. Albert Mangrove
Lady Emerson
Rechtsanwalt Douglas
Myrna Emerson
Schwester Harris
Butler Anthony
Edward Appleton / Die Blaue Hand
Miss Mabel Finley
Wärter Reynolds
Robert Emerson
Charles Emerson
Richter
Sir John
