Case Closed Volume Seven is a manga by Gosho Aoyama, and it was published in North America by Viz Media in 2005. The series is rated “T+” for older teens; personally, I would agree with this rating.
Jimmy Kudo is a high school detective who was shrunk down to his first grade self after he was caught by a crime organization and forced to take an experimental poison. Jimmy had been left for dead, so the criminals have no idea that he is actually still alive. Jimmy has taken on the identity of Conan Edogawa and claims to be a relative of family friend Dr. Agasa. As Conan, Jimmy goes to live with his friend, Rachel Moore, who is unaware that Conan and Jimmy are the same person. Rachel’s father, Richard, is a bumbling private investigator, so Jimmy hopes to be able to use this as a resource to track down the crime organization and find a way to return to his normal self. As Conan, Jimmy is able to covertly help Richard solve the cases that happen in the Case Closed series.
There are a total of three mysteries that appear in Volume Seven. The first mystery is the resolution to the mystery about the murder of a famous writer that appeared at the end of Volume Six. This mystery is resolved in the first chapter of this volume, and there is no real difference between the telling of this story between the manga and anime tellings of it. Since I’d already seen this mystery in the anime, I already knew what was coming.
The second mystery makes up the bulk of the content of Volume Seven. Richard receives a mysterious letter and a payment for his services from a resident of Moon Shadow Island. Richard, Rachel, and Conan travel to the island to try to figure out what’s going on. They quickly learn that the individual who supposedly sent the letter died 12 years earlier in his burning house while playing Beethoven’s “Moonlight Sonata” on the piano.