Edward G. Robinson

Professor Richard Wanley

Joan Bennett

Alice Reed

Raymond Massey

Dist. Attorney Frank Lalor

Edmund Breon

Dr. Michael Barkstane

Dan Duryea

Heidt / Tim, the Doorman

Thomas E. Jackson

Inspector Jackson

Dorothy Peterson

Mrs. Wanley

George McFarland

Boy Scout who finds Mazard's Body

Robert Blake

Dickie Wanley

Arthur Loft

Claude Mazard / Frank Howard / Charlie the Hatcheck Man

Frank Dawson

Collins, the Steward

Frances Morris

Stenographer (uncredited)