Guy meets with Miriam. Pregnant by someone else, she now refuses to give Guy a divorce and threatens to cause a scandal. Guy relays the bad news to Anne, metaphorically commenting that he would like to "strangle" Miriam. Meanwhile, Bruno stalks Miriam through an amusement park and fatally strangles her on the "Magic Isle". Bruno then informs Guy that Miriam is dead, and expects him to follow through on murdering Bruno's father. Bruno sends Guy his house key, a map to his father's bedroom, and a pistol.
When the police question Guy about Miriam's death, he claims he was on a train at the time of the murder. The police determine his alibi is inconclusive because he could have left the train in time to commit the murder and continued his trip on another train. Guy is not arrested, but the police assign an officer to trail him to ensure he does not flee while they investigate.