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!