Cast
Gregory Gaye
Enrico Borelli
Benson Fong
Opera Supernumerary (uncredited)
Margaret Irving
Mme. Lilli Rochelle
Maurice Cass
Mr. Arnold
John Bleifer
Murdered Orderly (uncredited)
Thomas Beck
Phil Childers
Joan Woodbury
Dancer in Opera (uncredited)
Frank Fanning
Cop (uncredited)
William Bailey
Detective (uncredited)
Stanley Blystone
Backstage Cop Who Shoots Gravelle (uncredited)
Jim Farley
Detective (uncredited)
Keye Luke
Lee Chan
Nedda Harrigan
Mme. Lucretia Borelli
Charlotte Henry
Mlle. Kitty
Boris Karloff
Gravelle
Frank Conroy
Mr. Whitely
Adolph Faylauer
Opera Spectator (uncredited)
Otto Fries
Innkeeper (uncredited)
Tom McGuire
Pop Morris - Stage Doorman
Marc Lawrence
Undetermined Minor Role (uncredited) (unconfirmed)
Bud Geary
Cop (uncredited)
Warner Oland
Charlie Chan
William Demarest
Sergeant Kelly
Guy Usher
Inspector Regan