Horatio 'Boston Blackie' Black

Chester Morris

Acting

Doris Howell

June Vincent

Acting

Insp. William R. Farraday

Richard Lane

Acting

Joan Howell (as Patricia White)

Patricia Barry

Acting

The Runt

George E. Stone

Acting

Sgt. Matthews

Frank Sully

Acting

Igor Borio

Edward Norris

Acting

Margie O'Reilly, alias Sandra Doray

Fay Baker

Acting

Mason Carter

William Forrest

Acting

Claire Carter

Sarah Selby

Acting

Helen Kenyon

Mary Currier

Acting

Party guest

Bess Flowers

Acting