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Warner OlandCharlie Chan
Boris KarloffGravelle
Keye LukeLee Chan
William DemarestSergeant Kelly
Guy UsherInspector Regan
Margaret IrvingMme. Lilli Rochelle
Gregory GayeEnrico Borelli
Nedda HarriganMme. Lucretia Borelli
Frank ConroyMr. Whitely
Charlotte HenryMlle. Kitty
Thomas BeckPhil Childers
Maurice CassMr. Arnold
Tom McGuirePop Morris - Stage Doorman
Marc LawrenceUndetermined Minor Role (uncredited) (unconfirmed)
Joan WoodburyDancer in Opera (uncredited)
William BaileyDetective (uncredited)
Charles BancroftSoldier in Opera (uncredited)
John BleiferMurdered Orderly (uncredited)
Stanley BlystoneBackstage Cop Who Shoots Gravelle (uncredited)Myrta BonillasVillager in Opera (uncredited)Raymond BrownGuard (uncredited)Carita CrawfordDancer in Opera (uncredited)Patrick CunningVillager in Opera (uncredited)Zari ElmassianMme. Rochelle (singing voice) (uncredited)Frank FanningCop (uncredited)
Jim FarleyDetective (uncredited)
Adolph FaylauerOpera Spectator (uncredited)Larry FisherCop (uncredited)
Benson FongOpera Supernumerary (uncredited)
J. C. FowlerOpera Spectator (uncredited)
Otto FriesInnkeeper (uncredited)
Bud GearyCop (uncredited)Milton GowmanVillager in Opera (uncredited)Herschel GrahamVillager in Opera (uncredited)Harrison GreeneDetective (uncredited)
Julia GriffithOpera Spectator (uncredited)
