Just out of jail and vowing to go straight, former jewel thief Boston Blackie, undertakes the reformation of a pretty blonde who has stolen a necklace from a cabaret dancer. He learns that the jewel belongs to the mother of the blonde girl, and the blonde's philandering father gave it as a gift to the cabaret girl. Now, Blackie must find a way to return the necklace to the owner's safe without arousing the suspicions of the girl's family.

Corporal Jack Borden, of the Northwest Mounted Police, trails the man who killed his partner to New York City. The killer is an unscrupulous promoter who is selling worthless stock in a gold mine. Borden, with the help of Blanche Hall, locates the man in a Bowery dive, but he escapes and Borden tracks him back to Canada. Along the way, he discovers that Blanche and his sweetheart, Milly, are long-separated sisters and brings about a reconciliation.