Absolutely lame entry in the series. Except for the opening hook there's no atmosphere, a plotline that only Cal Tech could unravel, and a lead actor more suited for Father Knows Best than the sinister Shadow. Then too the fractured comedy crowds out anything more serious. As a mystery, it's about as involving as an ashpit. Okay, some snappy wisecracks are occasionally amusing, but just what the producers thought they were doing when they threw this mess together beats me. As a fan of the memorable old-time radio show, I'd like to sue Monogram for movie sacrilege. No, there's no need to go on. And please, I take no satisfaction in ridiculing this concoction. But a flop is a flop and this one just goes splat.