Andy Griffiths is Terry's best mate. He is also Australia's number-one children's author. His books, including the popular Treehouse series, have been hugely successful internationally, winning awards and becoming bestsellers in the UK and the USA as well as in his homeland, Australia. Andy thrives on having an audience: he has worked as a high-school teacher, been the lead singer in a rock band and a stand-up comedian. He is a passionate advocate for literacy, has two daughters and lives in Melbourne, Australia.
Terry Denton is Andy's best mate. He is also a bestselling and award-winning writer and illustrator based in Melbourne, Australia. Among other things, he worked on the Horrible Science series. He lives by the beach with his wife and three kids.
The 13-Storey Treehouse won the Sainsburys Children's Book Award, the Lancashire Fantastic Book Award, as well as the Coventry Inspiration Award.

Andy and Terry live in the WORLD'S BEST treehouse! It's got a giant catapult, a secret underground laboratory, a tank of man-eating sharks and a marshmallow machine that follows you around and shoots marshmallows into your mouth whenever you're hungry! Just watch out for the sea monkeys, and the monkeys pretending to be sea monkeys, and the giant mutant mermaid sea monster . . . Oh, and, whatever you do, don't get trapped in a burp-gas-filled bubble . . . !

Andy Griffiths and Terry Denton's fantastically funny The 13-Storey Treehouse is told through a combination of text and cartoon-style illustrations.