Conan, Heiji, Ran, and Kazuha are at a magic show. When the magician enters a cube of water with chains, something goes wrong and Ran and Kazuha rush to the stage ready to break it open. The magician escapes revealing it was part of the trick. Ran and Kazuha are invited to come to a party with the Magician. At the party, there are magicians there who were the fans of a famous magician. When there, a murder happens.

The mystery is solved and Heiji shows that it involves how the house is built. They reveal the hallway has mirrors on the door with identical rooms on the side to cause an illusion.