A chameleon-like social climber, Tom Ripley, is sent to Italy by a wealthy family to persuade their playboy son, Philippe Greenleaf, to return home and take over the family business. Seduced by Philippe's luxurious lifestyle, Tom becomes obsessed with him and his fiancée Marge Duval. When Philippe grows tired of Tom's fawning behavior, Tom hatches a plan to kill Philippe and steal his identity, forging his way into Philippe's life and wealth. As Tom continues his charade, he must outsmart those around him while facing the consequences of his actions in this suspenseful crime thriller.

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Some movies that have similar genres and were produced around the same time as Purple Noon include Nightfall, Dead Ringer, Hell Drivers, Le Trou, Cash on Demand, Shoot the Piano Player.