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Johnny Allegro (George Raft) trades in his life as a mobster to become an undercover agent for the government. His assignment is to investigate the mysterious Glenda Chapman (Nina Foch). After gaining her confidence by pretending to kill a police officer, Johnny persuades her to let him follow her to an island hideaway. Once there, Johnny discovers that her associate -- a counterfeiter named Morgan Vallin (George Macready) -- is about to inundate the States with a massive flow of fake cash. Wikipedia