- A young man infiltrates the underworld by pretending to be a convicted burglar. While undercover, he meets a young woman who turns out to be no more a part of gangland than he, but with similar reasons for disguising herself.
- Dave Dorgan, alias the "Colt Kid," is a crook who has just been released from Joliet. He heads to New York with a letter of introduction to Harry Miller, proprietor of a tough saloon on the East side. At a local club, David Strong, an idler, receives a phone call from his mother complaining that his youngest brother Arthur is out carousing. David locates Arthur at Miller's saloon, and finds the lad mixed up with Joan Gray, a siren from the slums. David takes Arthur's valuables and orders him to return home. The denizens in the saloon think David has just completed a quick hold up of Arthur. Miller comes forward and mistakes David for the Colt Kit. David goes along with the mistake. Joan decides that the Colt Kid can save her from a desperate situation; one in which she is being forced to rob customers at the saloon by "Coast-to-Coast Taylor," a gang leader who is in love with her. She rushes toward David, throws her arms around him, and announces to everyone that the two intend to get married. She whispers to David not to expose her, and tells him to get out of the saloon. David agrees, and when Miller objects, David declares that he and Joan will be married at once. They go through a fake wedding ceremony performed by Parson Smith, who is the piano player at the saloon. But Taylor declares that Joan will not leave the saloon and attacks David. David thrashes the gang leader and departs with Joan. Later, in Joan's apartment, David goes along with the husband routine to convince Taylor that he is truly Joan's man. In fact, David has fallen for Joan. He continues to play the role of the Colt Kid, fearing that she will leave him if she knows the truth. Taylor attempts to involve David in the gang's robberies, and proposes that they rob the Strong mansion during the wedding of David's sister.
David tells Taylor that he must work alone, and rushes to his home expecting to arrive in time for his sister's wedding. But Taylor has set a trap for David. After David leaves, Taylor sets out for the Strong mansion with a couple of policemen. Joan learns of the trap and dashes out to try to save David. Meanwhile, Dave Dorgan, the real Colt Kid, has arrived at Miller's saloon, and learns that someone has been impersonating him. Dorgan goes to the Strong home to get a share of the loot, but Joan arrives in time to prevent him from committing the robbery. David saves her from a savage attack by Dorgan. Taylor, Joan and David are arrested, but David is eventually released upon orders from his family. David pleads for Joan's discharge, when his sister runs to Joan and throws her arms around her. The two were friends in college, and Joan had been living in the slums to obtain material for a novel. David and Joan witness his sister's wedding, and visions of their own marriage take place.
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