From Detective Conan Wiki
Cast
Case
Situation
Series of Murders
Location: Tsukikage Island
Victim: Kawashima Hideo, Kuroiwa Tatsuji and Nishimoto Ken
Suspects: Shimizu Masato, Hirata Kazuaki, Murasawa Shuuichi, Kuroiwa Reiko, and Asai Narumi
Kogoro Mouri received a letter and headed to Tsukikage Island. He then found out that the man requesting for the investigation was already dead. Asou Keiji was a world-reknowned pianist who killed his family and set his house on fire while playing Beethoven's Moonlight Sonata.
People
Resolution
Conan couldn't stop the killer from committing suicide, but he played one last music piano code message while the building was burning away: "Thank you, little detective."
See also