A crime spree in New York forces the police commissioner to turn to Englishman Simon Templar, who fights lawlessness and corruption through unorthodox methods. Templar sets his sights on individual crimes bosses, and after bringing down two vicious leaders through disguise and deception, discovers that there is a mastermind behind all the city's crime.

Horace Vendig always gets what he wants. Even as a poor youth, he charmed his way into high society by getting the father of his friend, Martha, to foot the bill for his Harvard education. When Vic, another childhood pal, is invited to Horace's mansion for a party, he brings along Mallory Flagg, who happens to bear a striking resemblance to Martha. As Vic and Horace reunite, old resentments rise to the surface.

A female version of the man in the iron mask. In this version the mask is put on a princess (patricia medina) rather than a prince as in the original book by Alexander Dumas.

The murder of a Wax Museum proprietor and some other strange goings-on in the vicinity prompt a police investigator to determine whether the killer is one of the principles who wants to own the museum or if Jack the Ripper has returned to killing after a hiatus of ten years.