The Secret of Platform 13

Three nursemaids venture off their magical island during the once-every-nine-years open window between the island and the real world. In the process, their charge, the baby prince of the king and queen of the island, is stolen by an evil woman desperately longing for a child. The king and queen are bereft. Finally, nine years pass and the royal couple sends an entourage of magical beings to find and rescue the lost prince.