Mori Kogoro's Grand Lecture (Part Two) An incident occurs at the venue where Kogoro's lecture is held. Inokoshi, an actor who was scheduled to participate in the talk event, was killed by someone in a closed dressing room. Kogoro infers that the former manager, Cold Spring, is the culprit, and reveals a closed-room trick using a stick. However, the suspect's cold spring confessed to a completely different murder case. It was Junko, the owner, who used a cane to push the cold spring down the emergency stairs. The tip of the cane of the cold spring matches the nape of his body. Reizumi states that Junko couldn't forgive him for neglecting his predecessor's way.