Secret of Platform 13

Under Platform 13 in one of London's busiest train stations is an old doorway. Behind that door is the entrance to a magical kingdom -- an island where humans live happily with mermaids, ogres, and mysterious creatures called mistmakers. When a beastly woman named Mrs. Trottle kidnaps the island's young prince, it's up to a strange band of rescuers to find him and save him. But can the rescuers -- an ogre, a hag, a wizard, and a fairy -- troop around London unnoticed?