It is the Christmas Holidays and reformed thief, Boston Blackie goes to Castle Theater to pick up players who will perform for prisoners that are still in prison. He takes a girl with him who has a brother already in prison. She has visited the prison twice in the month, so is not suppose to visit again. However when the group is completed the girl is included as well as Inspector Farrady. One of the clowns in the show is kidnapped and replaced by a con who wants to get even with two ex-partners. Boston Blackie figures out that a con has replaced one of his clowns but is unable to stop him. Blackie's clothes are stolen and a murder is committed. Of course, the Inspector immediately suspects Blackie of being involved. Now it is Blackie's job to find the killer, exonerate himself and help the girl free her brother.
Chester Morris
as Boston Blackie
Adele Mara
as Eve Sanders
Richard Lane
as Inspector Farraday
George E. Stone
as The Runt
Lloyd Corrigan
as Arthur Manleder
Walter Sande
as Detective Mathews
Larry Parks
as Joe Trilby
George McKay
as Roggi McKay
Cy Kendall
as Jumbo Madigan
Paul Fix
as Steve Caveroni
Ben Taggart
as Warden
Ernie Adams
as Pop - Stage Doorman (uncredited)
