The final colour installment in this New York Times bestselling series! George and Harold, and their doubles, Yesterday George and Yesterday Harold, have a good thing going. Two of them go to school, while the other two hide in the tree house and play video games all day—then they switch! But Mr. Meaner, has created a method of mind control that transforms their fellow students into attentive, obedient, perfect children. Now it's all in George and Harold and Yesterday George and Yesterday Harold's hands!