As the police continue their investigation, they discover a plastic tea bottle filled with water in the dressing room, match cinders floating on the water, and Tetsuyama's silver-gemed ring. It is also revealed that all the suspects have been seen in the hotel after the sauna was closed disproving their previous theory.
Mentre proseguono le indagini, vengono rinvenuti degli oggetti che fanno pensare che qualcuno si sia appostato di notte all'interno dei bagni termali
Conan consigue resolver el caso, y Haibara tomará venganza de su pequeño incidente con Conan.
Conan aconsegueix resoldre el cas, i Haibara prendrà venjança del seu petit incident amb Conan.