Andy Griffiths and Terry Denton's creative partnership began with Just Tricking! in 1997 and now extends to seven Just books. Their partnership continued with The Bad Book (and its sequel The Very Bad Book), the off-the-wall success of The Cat on the Mat is Flat, the brilliant Just Macbeth, the anatomically hilarious What Body Part is That? and the crazy new series The 13-Storey Treehouse. They are now published all over the world including the US, where Andy's Bum books have made the New York Times bestseller lists.