Adam and the Witch Queen

Ever since his dad went missing two years ago, Adam just can't seem to concentrate in school. He spends most of his time making paper airplanes instead. When one of the planes starts a fire in the cafeteria, Adam gets suspended. At home, his frustrated mother loads him with chores. But while getting out the lawn mower, he discovers a mysterious trap door in the floor of the shed. To his amazement, it leads to a strange city, where he soon finds himself in trouble... again. 

This time, he's in good company-he gets snatched from danger by a group of rebels. Their goal? Take down the Witch Queen. Adam's goal? Get home. Unfortunately, it looks like he'll have to help the rebels before they can help him.