The Clue in the castle wall

Barbie is one of the top girls' properties - the world's #1 fashion doll. Now Scholastic is on the Barbie bandwagon with stories starring Barbie as a reporter with a nose for a mystery. Barbie and Christie are very excited. They're going to spend their vacation visiting a castle in England! But wherever Barbie goes, a mystery is sure to follow. A priceless sapphire crown has disappeared inside the castle! Can Barbie and Christie track down the crown -- and catch the jewel crook in the act?