A gangster who operates a sleazy dance hall uses a sadistic bodyguard to keep his girls afraid and his customers in line. A merchant marine seaman is found murdered at the place and suspicion quickly falls upon the operator of a dime-a-dancehonky tonk joint. A federalundercover agent is planted in the place to gather evidence, and he soon learns that the dive is only a cover-up for diamond-smuggling activities, and that one of the operation's henchmen, who is handy with a switch-blade knife, is the actual killer. Before they can be arrested, the henchman kills his boss and is shot while trying to escape.
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