Jeff Brown's Flat Stanley: The Great Egyptian Grave Robbery

Flat Stanley Stanley Lambchop wakes up one morning to find a notice-board has dropped on him in the night, leaving him happy and healthy, but only half an inch thick. It's a little unusual, but he finds he can fly like a kite, be sent on holiday through the post and can use his special new skills to catch some art thieves. Still, he's glad when his brother Arthur thinks to use the bicycle pump to inflate him back to his normal shape.