H. Bruce Humberstone Director Warner Oland Charlie Chan Actor Boris Karloff Gravelle Actor Keye Luke Lee Chan Actor Charlotte Henry Mlle. Kitty Actor Thomas Beck Phil Childers Actor Margaret Irving Mme. Lilli Rochelle Actor Gregory Gaye Enrico Borelli Actor Nedda Harrigan Mme. Lucretia Borelli Actor Frank Conroy Mr. Whitely Actor Guy Usher Inspector Regan Actor William Demarest Sergeant Kelly Actor Maurice Cass Mr. Arnold Actor Tom McGuire Pop Morris Actor Fred Kelsey Dugan Actor Selmer Jackson Hudson Actor Emmett Vogan Smitty Actor Benson Fong Opera Supernumerary (uncredited) Actor W. Scott Darling Screenwriter Charles Belden Screenwriter John Stone Producer Lucien N. Andriot Cinematographer Alex Troffey Film Editing Charles Maxwell Original Music Duncan Cramer Art Director Lewis H. Creber Art Director Herschel McCoy Costume Design