A dangerous amnesiac escapes from an asylum, hides in the opera house, and is suspected of getting revenge on those who tried to murder him 13 years ago.
Warner Oland
as Charlie Chan
Boris Karloff
as Gravelle
Keye Luke
as Lee Chan
William Demarest
as Sergeant Kelly
Guy Usher
as Inspector Regan
Margaret Irving
as Mme. Lilli Rochelle
Gregory Gaye
as Enrico Borelli
Nedda Harrigan
as Mme. Lucretia Borelli
Frank Conroy
as Mr. Whitely
Charlotte Henry
as Mlle. Kitty
Thomas Beck
as Phil Childers
Maurice Cass
as Mr. Arnold
