The fourth and final installment of the New York Times bestselling series!

It’s Miles and Niles’s final year at Yawnee Valley Science and Letters Academy, and the Terrible Two have one goal: an epic prank. Something that will leave a lasting legacy at their school. Which should be easy-peasy for these experts. But their smooth sailing gets downright bumpy when they find out that the new superintendent is none other than Bertrand Barkin, their principal’s father . . . and their sworn enemy. Now that former Principal Barkin is Acting Superintendent Barkin, he has a first order of business: his long-promised revenge on the Terrible Two.