Nagami's body is discovered in the hotel pool. Megure questions Samaki, Hamaka, and Toyoshima regarding the actions they took after they left Nagami alone in the pool. The bellboys describe the situation at the pool while they were searching for Nagami, leading Conan and Sera to investigate the pool and discover which of her three acquaintances murdered her. They reproduce the manner in which the body disappeared in an experiment, bringing them closer to the culprit...