Kogoro, Conan, and Ran run into a typhoon on their way home from the hot springs and are forced to spend the night at the train station with salesman Hokari, factory manager Takegami, backpacker Carl, assemblyman's secretary Norikoo, local old woman Fune, stationmaster Inagaki, and station employee Masako. When Kogoro exits the station's hot spring, he discovers a scrap of paper in his coat pocket. On it is written the message “Mori-sensei, someone will be killed here tonight. Please catch the culprit. The culprit is--". Later, a murder actually does occur...