
Mlle. Camille L'Espanaye

Dr. Mirakle

Pierre Dupin

Paul

Mme. L'Espanaye

Prefect of Police

Morgue Keeper

Janos The Black One

Woman of the Streets

Sideshow Spectator (uncredited)

Franz Odenheimer (uncredited)

Gorilla (uncredited)

Former detective Nick Charles has retired from police work, preferring a life of cocktails, parties, and relaxation with his wealthy wife, Nora. Their holiday is interrupted when the daughter of Nick’s former client asks for help finding her missing father, eccentric inventor Clyde Wynant. When Wynant’s body is discovered, Nick is drawn back into the investigation, with Nora eagerly joining him. As the couple questions Wynant’s family, friends, and business associates, a tangled web of greed, deception, and murder begins to unravel.

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.