Simon Templar joins up with Professor Hamish Grant at an archaeological dig at a rural part in a Greek island.
The Professor finds a valuable artefact, made of gold and it attracts the attention of Aristides Koralis (Oliver Reed.) He's a gangster who left for New York as a kid.
Now he has returned on the run from American gangsters he stole from. Arriving at his uncle's village, he is arrogant and has his eye on Sofia (Imogen Hassall), his cousin.
She and her father run a small impoverished inn. Sofia is engaged to a local but has her head turned by Aristides who gives her a valuable necklace.
The Saint notices that Aristides is carrying a gun, running away from trouble and will steal again.
Templar sets up an elaborate plan to make sure Aristides does not hang around for long.
This certainly is a hokey story. Enlivened by Reed and Hassall. Reed certainly has a ba American accent, Hassall is fiery and sexy. The studio set designers worked overtime to pass it all off as Greece.