The Momos Musuem of World History and Culture has been robbed! And by the looks of it, the culprits were professionals! As Alex and the Prices try to track down the thieves, they also learn that the musuem has become less and less popular lately, due to the younger generations' lack of interest in history. Will the Princes' combination of charismatic charm and historical knowledge succeed in restoring the musuem's popularity as well as its treasures?