When Dr. Anthony Edwardes arrives at a Vermont mental hospital to replace the outgoing hospital director, Dr. Constance Peterson, a psychoanalyst, discovers Edwardes is actually an impostor. The man confesses that the real Dr. Edwardes is dead and fears he may have killed him, but cannot recall anything. Dr. Peterson, however is convinced his impostor is innocent of the man's murder, and joins him on a quest to unravel his amnesia through psychoanalysis.
The middle aged matron at a Norwich school wins a large prize in a French lottery. She is murdered in London and the murderer's secretary impersonates her and draws the old lady's prize money. There follows a series of killings until the murderer realises that he is trapped and commits suicide.
