Dick and his cronies investigate strange goings on at a fishing village and discover a Nazi plot to poison England's water supply.
Threadbare and creaky early Hammer production based on the very popular BBC radio series. The filmmakers would have been better off getting the radio cast, as none of the acting is very good. Bush and Wincott make the most of their villainy, but that's not necessarily a good thing. The film in general is poor in all respects, being little more than a crudely filmed representation of a radio program, and is only of real interest as a footnote in Hammer's history. More than anything it resembles a Three Stooges short adapted into a spy drama, complete with lame jokes and physical comedy. Probably the best thing is the theme music (The Devil's Gallop by Charles Williams), though even that might mislead modern viewers into expecting the Spanish Inquisition to show up on the scene!
Followed by two sequels, Dick Barton Strikes Back and Dick Barton at Bay, before Stannard's early death put an end to the series.