Conan, Ran and Kogoro are called to Moonshima, a small island in Izu, in a letter from a mysterious client. However, the client was a pianist who should have died playing the piano sonata "Moonlight" 12 years ago. The third memorial service of the former mayor, which I happened to see at the community center that I visited to investigate the client. In the midst of that, "Moonlight" began to flow...