Along with a later film featuring Michael Caine as Alfie, Bonjour Tristesse is an examination of the destructive sociopathic personality.
The callous, unfeeling sociopaths in this film by Otto Preminger are brilliantly portrayed by Jean Seberg and David Niven: engaging manipulative narcissists incapable of any true feeling for others. As with all sociopaths, skilled in the art of psychological murder.