From The Chronicles of Narnia by C.S. Lewis
Why your tween will love them: The Pevensies step through a secret portal in their wardrobe, leading them to the world of Narnia. They find out they’re actually kings and queens about to lead good forces in a battle against an evil witch. Your tween will discover the childlike magic that results from being royalty in a mythical world.
Why you’ll love them: Age is just a number for these kids. In Narnia, Peter, Susan, Edmund and Lucy are given major power and responsibility despite their years. You’ll love heroes that will encourage your tween believe in his own abilities.