In Mexico, a financier on the run poses as a man he just murdered, only to find out that the man was also a murderer.

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.

A chance photograph may reveal a murderer's identity - and someone's after the photographer!