作者: Eva Ibbotson & Sue Porter
The Secret of Platform 13 is a children's novel by Eva Ibbotson, and illustrated by Sue Porter, first published in 1994.
A forgotten door on an abandoned railway platform is the entrance to a magical kingdom--an island where humans live happily with mermaids, ogres, and other wonderful creatures. Carefully hidden from the world, the Island is only accessible when the door opens for nine days every nine years. When the beastly Mrs. Trottle kidnaps the Island's young prince, it's up to a strange band of rescuers to save him. But can the rescuers--an ogre, a hag, a wizard, and a fey--sneak around London unnoticed? Fans of Roald Dahl, Lewis Carroll, and E. Nesbit will delight in this comic fantasy.
If you went into a school nowadays and said to the children "What is a gump?" you would probably get some very silly answers. "It's a person without a brain, like a chump," a child might say.