New York City detectives Dan Muldoon (Barry Fitzgerald) and Jimmy Halloran (Don Taylor) are assigned to investigate the mysterious murder of a young woman. Following the leads in the case, they come upon a jewel theft ring that has been plaguing New York society. Muldoon and Halloran finally untangle the skein of thieves and discover the murderer to be one of the slain woman's cohorts in the jewel gang. When cornered by the detectives, there is a violent shoot-out.