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.
| Actor | Role |
|---|---|
 StrongheartStrongheart the Dog | Strongheart the Dog |
 Bob CusterBoston Blackie | Boston Blackie |
 Corliss PalmerSylvia Markham | Sylvia Markham |
 Rosemary CooperNecklace Nellie | Necklace Nellie |
 Coit AlbertsonDenver Dan | Denver Dan |
 William WorthingtonJohn Markham | John Markham |
 Florence WixMrs. John Markham | Mrs. John Markham |
 J.P. LockneyRob Nichols | Rob Nichols |
 Violet PalmerAnnette | Annette |