Most all of the 1940s Columbia "Boston Blackie" films starring Chester Morris are worth watching. This entry has Blackie vouching for some convicts (remember, Blackie himself is a reformed ex-con), trying to get them early releases so they can work in factories aiding the war effort. A judge agrees, and lets them out to begin work. Obviously, things do not work out as planned...
Morris's personal charm and colorful acting style always help the film along, and his sidekick The Runt and his antagonists from the police force return from the earlier entries in the series. It's a fast moving 65 minutes, and like any of the b-movie directorial efforts of William Castle at Columbia in the 1940s, it features a number of clever visuals and plot contrivances. Also, the film is NOT a traditional murder mystery, but I don't want to give anything away, so you'll have to see it yourself. Definitely worth finding for fans of b-movie detective films. And it's always great to see Douglas Fowley as a gangster again!