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