Andy Griffiths and Terry Denton began their creative partnership with Just Tricking! in 1997. They have now collaborated on eight Just books, the ground-breaking The Bad Book, The Cat On The Mat Is Flat, the Bum trilogy (which made the New York Times bestseller list), the bestselling The Very Bad Book and now the phenomenal Treehouse series. The 13-Storey Treehouse, The 26-Storey Treehouse, The 39-Storey Treehouse and The 52-Storey Treehouse have all won ABIA awards for their category. The 52-Storey Treehouse also won the overall ABIA for Best Book of the Year - the first time a children's title has ever won this award.