Kogoro receives tickets to the grand opening of the Mirapolis complex and is unwittingly forced to take along Ran, Conan, and the Detective Boys. At the opening speech, tensions run high as the Mirapolis staff begin to let their past with the owner get the better of themselves. Soon after, Conan and Ai discover a body by the Mirapolis's pool. With a little help from Heiji, it's up to Conan to solve the murder and prevent anything else from happening.