Synopsis
One day, Julie, a prima donna, receives a letter from the Phantom Thief Kid. The letter warns her that the Kid will steal a precious gem that she owns. Although she asks Rachel Moore for her help, it is impossible to decipher the secret code hidden in the letter. Meanwhile, Conan and his friends board a flight at the invitation of Julie, but a murder is committed on the plane and someone even knocks the pilots out. Conan and his friends must keep the plane from going down while catching the killer at the same time.