Dr. Tony Flagg's friend Steven has problems in the relationship with his fiancée Amanda, so he persuades her to visit Tony. After some minor misunderstandings, she falls in love with him. When he tries to use hypnosis to strengthen her feelings for Steven, things get complicated.

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.