As a shot rings out, a girl stumbles into detective John Conroy's hotel room. He hides her from the hotel detective, but when he returns to the room, she has vanished, leaving him a note with her address. Later that evening, in response to the note, he visits the woman, Marian, at the home of Mr. Barstow. In return for favors he granted to her father, Barstow has asked Marian to seduce Conroy. Conroy is on the trail of a gang of counterfeiters, secretly headed by Barstow. Hoping to thwart him, Barstow circulates Conroy's photo to the gang. When this does not work, Barstow sends Mollie Carter, one of the gang, to steal a paper from Conroy's room, but he catches her in the act and calls the police. In anger, she reveals Marian's connection with the gang. In the meantime, Marian has fallen in love with Conroy and when she overhears Barstow plan his murder, she rushes to stop it. Escaping the ambush, Conroy heads to Barstow's house to round up the rest of the gang. In the ensuing struggle, Barstow is killed and Conroy wounded. He awakens in the hospital, to find Marian watching anxiously over his sickbed. Delighted, he announces his intention to marry her.