Shopgirl Rhoda Regan is in love with the Harmony Lad, the leader of a New York street gang called the Hudson Dusters. After two gang murders are committed in the Pepper Box, a local cabaret, the Harmony Lad promises his worried sweetheart that he will abandon the gang for a singing career, and true to his word, he soon accepts a job on the Pepper Box stage. When Stumpy Darcy, the new leader of the Dusters, kills rival gang leader Wedge Barker, who had flirted with Stumpy's girlfriend, Mamie Conl...