Move over, Captain Underpants, a couple of new pranksters are in town. Narrated by fifth-grader Wilbur and featuring his third-grade brother, Orville, this hilarious story follows the antics of two boys with overactive imaginations and a comfortable sibling relationship. The action is divided into three "books," with six chapters each. In the first, the brothers are determined to catch a crook. They make a windfall by giving lessons in being annoying to their classmates, are reprimanded by the principal (who is also their mother), and still manage to foil a bank robber on the way home from school. Next, while searching for treasure, they find a mysterious box in the closet. After they finally open it, they discover that the contents, although not worth money, are still valuable. The final installment has the duo building a catapult designed to overthrow a king and using it instead to defeat a bully. Full-colour illustrations.