Meitantei Conan › Season 1

Chapter 11 — Moonlight Sonata Murder Case

Kogoro, with Ran and Conan, travels to Tsukikage Island after receiving a cryptic letter and payment in advance from Asoh Keiji, a famous pianist, requesting his services. On the island, they discover that Keiji had been dead for twelve years; legend has it that he murdered his family before locking himself in his estate and playing Beethoven's Moonlight Sonata while the estate burned to the ground. Keiji's piano is located in the community hall, the same location where the previous mayor Kameyama Isamu was found dead and Moonlight Sonata was also heard when he died. During the funeral for Mayor Kameyama Isamu, Kawashima Hideo , the richest man on the island, is found drowned to death; the aforementioned song is heard again. Conan interprets the letter as indicating that the murders are just starting and the others spend the night near the piano along with Dr. Asai Narumi. The assisting officer explains to Conan that Keiji had a son named Seiji, who survived his family's massacre as he was in a Tokyo hospital. More sheet music from Keiji can be found in a safe at the community hall. As the police interrogate everyone who was at the funeral the next day, the second movement of Moonlight Sonata is heard and the current mayor Kuroiwa Tatsuji is found violently murdered in the PA room with a knife plunged into his back. (Source: Wikipedia)