Andy Griffiths and Terry Denton are a creative partnership that began with 'Just Tricking!' in 1997 and now extends to eight "Just" books and more than a million copies sold, the ground-breaking 'The Bad Book', the off-the-wall success of '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 treehouse series. Andy and Terry have won numerous kids choice awards and many of their titles are nominated every year. In 2012, 'The 13-Storey Treehouse' won the ABIA award for older readers.