Heiji tells Conan he found someone that has knowledge on Eisuke's father; However that person is dead but his grandson, Souhei Nishigun, has a photograph of Eisuke's father. Conan, Haibara, and Agasa travel to Nishigun's apartment and realize that someone has stolen Nishigun's photograph album and deleted the data off his computer. Conan notices that the room contains perspiration from the culprit meaning the robbery occurred very recently. Conan concludes that one of Nishigun's three friends is the culprit as they are the only people with keys to his apartment.