Christine greets Perrin at her apartment's front door in a demure high-necked black-velvet dress, then turns around and shows that the dress is backless, displaying discreet buttock cleavage (a similar dress is seen once again—at a symphony concert—in the sequel film " The Return of the Tall Blond Man with One Black Shoe"). A slapstick love scene (watched by Milan and his cohorts on a television monitor) ensues, concluding with Milan's decision (despite Christine's belief that Perrin could not possibly be an agent) to have Perrin eliminated. More mayhem (including Maurice's learning the truth about his wife's affair) and treachery (including Christine's defection from Milan's group to save Perrin, with whom she has fallen in love) follow, climaxing in the deaths of not only agents from both Toulouse's and Milan's groups but also Milan himself, who only learns the truth about Perrin from Perrache just before he dies. Realizing how he has been fooled, Milan dies with a smile of appreciation. Maurice, who has repeatedly walked in on the aftermaths of the shoot-outs in Perrin's apartment, suffers a total mental breakdown.