Based on the Short Story: "From an unnamed story in Cosmopolitan" by Jack Boyle

SYNOPSIS:

When Boston Blackie was released from prison he vowed to go on the straight and narrow path of virtue. He is met a the prison gate by an old friend and Strongheart the dog, the real star of the movie. Meanwhile, Blackie gets involved with pretty blond Sylvia Markham who is suspected of stealing the "the Markham Necklace." Blackie knows she is innocent and instantly tries to help her by taking responsibility for it. He can't believe she's guilty because she has clear eyes; later general doubts about Blackie's honesty are refuted by her because he had clear eyes too. As it turns out one of the family secrets is that Sylvia's errant father, John, had given the necklace to dancer Necklace Nellie. Now Boston Blackie has to save the day by performing one final heist: Take the necklace from Necklace Nellie and return the necklace to its owner's safe without getting caught before Denver Dan can steal the necklace from Necklace Nellie.