A sinister crook is implicated in blackmail, greed for emeralds, a secret formula and murder. Thee episodes from a 1952 British television series called "Inspector Morley, Late of Scotland Yard, Investigates" were joined together and released theatrically.

Tod Slaughter goes about the countryside strangling everybody. His evil scheme is to destroy the family who wronged him. He has a secret lab complete with a torture chamber, featured in the films climax. Probably the most maniacal portrayal Tod ever gave.