It's Christmas at the Boston Blackie household, which means that Blackie is trimming the tree and the Runt is telling him that Christmas trees are bad luck. Will a Christmas mystery ensue? Well, a mystery there is, but oddly little time is devoted to the season aside from that opening and then a bit at the end.
Blackie rounds up a gang of theatrical friends, including Adele Mara as Eve, and buses them out to the prison for a Christmas show for the inmates. Eve's brother Joe (Larry Parks) is an inmate who is hot for revenge on two hoods who lined him up for this prison stretch; during the show, Joe steals a costume/disguise from one of the entertainers and escapes with the troupe on their way out. It isn't long before one of said hoods turns up murdered, and our old friend Inspector Farraday seems to have Blackie dead to rights for aiding in the escape, the murder, or both.
Less comic relief than expected in this one, though the banter between Blackie and Farraday is, as always, crisp and catchy. Chester Morris and Richard Lane both look very confident in their third film in the roles.