The Champagne Murders (1967)

In France, the friends Paul Wagner and Christopher "Chris" Belling take a prostitute in their sport car and go to a park. Out of the blue, they are attacked by thieves and Paul is hit on the windshield and has a serious head injury. The woman is strangled by the attackers. Paul spends one year at a clinic to recover and Christopher's wife Christine Belling with the support of her secretary Jacqueline administrate Paul's family business of Wagner champagne. When Paul is recovered, he is different and Christine wants to cheat on him and sell his business, but Paul refuses the deal. Chris expects that Christine buys a yacht for him, if she succeeds. Paul travels with Christopher to Hamburg in a business trip and he recalls when Chris was a rent boy and Paul introduced him to the wealthy Christine. During the night, Paul goes to a restaurant, gets drunk, goes to a park with the prostitute Paula and faints. Later the police find Paula strangled in the morning. When Christine receives an anonymous letter about the murder of the woman, she blackmails Paul that is amnesic. When he goes to the party of the artist Evelyn Wharton, Paul drinks too much and when he wakes up, Evelyn is strangled by his side. Is Paul a serial-killer?