Though Columbia's Crime Doctor series officially ended with Crime Doctor's Secret, the studio trotted out the property one last time with the misleadingly titled Devil's Henchman. Instead of his usual "Crime Doctor" character Dr. Robert Ordway, (Warner Baxter) travels under the name of Jess Arno. It's all a ruse, of course; Ordway is working incognito, the better to track down a gang of smugglers. Forever hanging around the waterfront, gumming up the works for Ordway, is the pea-brained Captain (Harry Shannon), who's a lot smarter than he lets on. "B"-picture favorite Mary Beth Hughes is a delight as always as a stylish gangster's moll. Equally well-cast in surprising characterizations are Regis Toomey and Mike Mazurki.
by Hal Erickson synopsis