Andy Griffiths and Terry Denton began their creative partnership with Just Tricking! in 1997. They have now collaborated on eight Just books (with more than a million copies sold), the ground-breaking The Bad Book, the off-the-wall The Cat on the Mat is Flat, and now the phenomenal, bestselling, award-winning Treehouse series (every title in the Treehouse series has won an ABIA award.) In 2015, The 65-Storey Treehouse was the fastest selling Australian book ever, and the bestselling book in any category.