Leonard has overheard Christine's admission, and cheerfully confirms to Sir Wilfred that he had indeed killed Mrs. French. Sir Wilfrid is infuriated but helpless to stop him now, thanks to double jeopardy laws. Christine also suffers a major shock when she finds Leonard has been having an affair with a younger woman and plans to abandon Christine for her, feeling he and Christine are 'even' now. In a jealous rage, Christine grabs a knife earlier used as evidence (and subtly highlighted by Sir Wilfrid's monocle light-reflection), and stabs Leonard to death. After she is taken away by the police, Sir Wilfrid, urged on by Miss Plimsoll, declares that he will take on Christine's defense.