She then descends the stairs, walks into the garden, and then walks up another stairway to Stefan""s back door, where she again knocks and receives no answer.There, as she was lying on her stomach in the bottom of the raft (after calling out: "Come on, Paul, I know you""re out there"), the hand of an unseen killer held her left shoulder down as she was stabbed through her abdomen (from underneath the raft), with the bowie knife piercing out the center of her back through her spine(# 4 death).He protests to the Headmaster and doctor that there was "interference" and he is really "sound as a bell.Lydecker: Did I?McPherson: Yeah.But he was really killed with a sash weight.Lydecker: How ordinary.My version was obviously superior.I never bother with details, you know.McPherson: I do.Because murder is his "favorite crime" and he writes about it regularly, the renowned, droll columnist Lydecker insists on helping McPherson in his assigned investigation, even hough he is a suspect:I know you""ll have to visit everyone on your list of suspects.