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.
Strongheart
as Strongheart the Dog
Bob Custer
as Boston Blackie
Corliss Palmer
as Sylvia Markham
Rosemary Cooper
as Necklace Nellie
Coit Albertson
as Denver Dan
William Worthington
as John Markham
Florence Wix
as Mrs. John Markham
J.P. Lockney
as Rob Nichols
Violet Palmer
as Annette
