Early Christmas shopping turns less than jolly when the Junior Detective League stumbles on a murder at a department store. Rachel's self-proclaimed karate rival sends Mr. Moore on the trail of a UFO. And Officer Yumi has to solve a complex puzzle to find out how her boyfriend, Japan's top shogi champ, really feels about her. Meanwhile, Conan pursues an even more baffling mystery: the identity of "Mary," the reclusive little girl with connections to some of his most enigmatic allies...