Andy Griffiths and Terry Denton's creative partnership began with Just Tricking! in 1997 and now extends to eight JUST books and more than a million copies sold, the bestselling The Bad Book, and its equally bad sequel, The Very Bad Book. They are now published all over the world including the US where Andy's BUM books have made the New York Times bestseller lists. In 2011, The 13-Storey Treehouse marked the beginning of a fabulous new series from the duo. The 26-Storey Treehouse was the bestselling Australian children's title in 2012. The 39-Storey Treehouse debuted at national No. 1 in September 2013 and is currently breaking sales records.