A mysterious girl named Masami Hirota came to Kogorō to ask for her father. After that the girl leaved, they're then making a search to find Masami's father, which he got found at the Tokyo Horse Racing Track. Kogorō and the others then follows him to his house. Once they found out, they call Masami, which came there in speed. Conan sees that Masami look more grown up then a teenage girl. They brought Masami to her father, which she was happy to see him and went home. Conan and the others see a strange figure who where spying on them. In the end, Masumi's father Kenzō Hirota got killed or killed himself.