Kaito and Aoko manage to get passage on the same train as the Queen of Ingram, her large jewel known as the Principality of Ingram's Crystal Mother, and her son the Prince Philip. Kaito has sent out an advance message saying he's after the jewel. After realizing the queen has a replica with her Kaito tries to figure out where the real jewel is hidden. When the Queen tricks Detective Nakamori into drinking with her the entire night Kaito realizes that his ice hasn't melted and realizes it must be the jewel. Kaito manages to steal the jewel only to be followed onto the roof by Philip and a man in black. Kaito learns the aurora stone isn't in the Crystal Mother and so he changes his focus to rescuing Prince Philip. In the end Kaito manages to get the Queen to show she isn't a strict mother but a caring mother, and he leaves the Crystal Mother in Aoko's glass.