Third and final film in the 'Inspector Hornleigh’ series of comedy-thrillers. Inspector Hornleigh (Gordon Harker), disappointed at not being handed an important spy case, is assigned by Scotland Yard to an army barracks to investigate the mundane thefts of supplies from the stores.
A man murdered at the Saint's doorstep manages to utter a few words to Simon Templar before he dies, sending him off to the quaint resort village of Baycombe where he confronts crime mastermind 'The Tiger' and his gang as they plan to smuggle gold bullion out of the country.
When his car breaks down out in the country, Sniffles the mouse takes shelter in an old mill, where he meets up with "Batty," a non-stop-talking little bat who later save Sniffles from a hungry cat.