A wealthy woman and her son are dead from an apparent hunting accident and suicide. The daughter, Princess Mira Julietta Vesparand, pulls the old Prince and the Pauper maneuver with Detective Conan's friend Mouri Ran. It is up to the great Detective Conan to switch them back and discover the truth behind that fateful day. Complicating the issue is the wily thief Lupin the Third, and he is after the "Queen Crown" owned by the Vesparand family. When two of legendary characters meet, who will win the day?!