There is pure excitement in the family as the group heads to London for the first time to watch mom, famous singer Gloria Glimmer, perform. But on a day trip to the National Gallery, Maddie witnesses what she believes to be an art theft and takes her sisters and their beloved and wacky nanny Miss Julia, on a wild and crazy adventure as they follow the supposed thief to his lair. Will the Glimmer Girls save the day? And will Maddie find what makes her shine?