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When a chemical manufacturer is killed after asking detective James Wong to help him, Wong investigates this and two subsequent murders. He uncovers a international spy ring hoping to steal the formula for a poison gas being developed by the first victim's company.
Boris Karloff , Clancy Cooper , Dick Reinhart , Ed Cassidy , Evelyn Brent , Frank Bruno , George Lloyd , Grant Withers , Herbert Evans , Hooper Atchley , John Hamilton , John St Polis , Lee Tung Foo , Lester Dorr , Lucien Prival , Lynton Brent , Maxine Jennings , Wheaton Chambers , Wilbur Mack , William Gould