Kimika asks Jirokichi to help her open a trick box created by a mid-19th Century tinkerer. Inside the box is Luna Memoria, the world's largest moonstone left to her by her late husband. The instructions to open the box are written on a piece of paper stuck between the pages of one of ten thousand books given to Jirokichi. In order to lure Kaito Kid, Jirokichi puts the trick box containing Luna Memory on display. Conan and friends try to figure out how to open the box, while Kid lurks nearby in disguise...