Alex and Katie embark on a new adventure, more exciting and more dangerous than ever before. They have to help Cinderella find her Prince who disappeared during an afternoon horseback ride. Everyone in the Palace is worried about the Prince and about Cinderella. What happened to him? Did he get lost? Was he kidnapped? Is he still alive? And will he and Cinderella ever be together again?
It is up to Alex and Katie to solve this mystery, rescue the Prince, and help Cinderella live happily ever after.