Ever tried to get out of going to school by pretending that you're dead? Ever managed to convince a friend that they're invisible? Ever been stuck in a gorilla suit and nearly put in a zoo? Andy has. Andy's the greatest practical joker in the world ... well, almost. He would be, if only his practical jokes didn't have the annoying habit of backfiring on him.

Andy and Terry have a new book to write, but there's a problem. A BIG problem. Well, quite a few big problems actually.... On a hill not too far away there is a tree. And in that tree there is a tree house. And in that tree house there is a bowling alley, a see-through swimming pool, a tank full of sharks, a giant rope swing, a library full of comics, a secret underground laboratory, a vegetable vaporiser and a free marshmallow-dispensing machine.

Zack Freeman is on his way to becoming a first rate butt-fighter. He has gone butt-to-butt with all kinds of stinky scoundrels and butts-gone-bad. But even our doody-full hero is a-gassed by these latest stench invaders. They're round, blue, and smelly. They're ruthless, cunning, and very cheeky.

Can Zack save the earth from butts gone berserk? Can he defeat the biggest, ugliest, meanest butt the world has ever seen? More importantly, will Zack and his butt ever find true happiness? It's an adventure you and your butt will never forget!

Ben Ripley may only be in middle school, but he's already pegged his dream job: CIA or bust. Unfortunately for him, his personality doesn't exactly scream "secret agent". In fact Ben is so awkward, he can barely get to school and back without a mishap. Because of his innate nerdiness, Ben is not surprised when he is recruited for a magnet school with a focus on science - but he's entirely shocked to discover that the school is actually a front for a junior CIA academy.