Some unknown man who knows Conan is in fact Kudo Shinichi lures Conan and the others (Mori, Ran, Tanteidan...) to Yokohama. This man takes Ran and the Tanteidan as hostages. He gives Conan a 12 hour time limit in which to solve a case. If it is not solved within that time, bombs attached to the hostages will explode.... To thwart this villain Conan has help from Heiji, Kaitou Kid, Hakuba.