The clue in the jewel box : Nancy Drew Mystery Series, Book 20

An antique dealer’s revelation about a former queen’s priceless heirloom starts Nancy on a trail of exciting adventures. Madame Alexandra, now living incognito in River Heights, asks Nancy to find her missing grandson. With only one clue to go on – a faded photograph of the prince at the age of four – the young detective begins her search. Nancy’s investigation unmasks a slick imposter and reunites the long-separated family in this suspense-filled story. Nancy and her friends help a woman search for her missing grandson.