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 off-the-wall The Cat on the Mat is Flat, and now the phenomenal, sales-breaking, award-winning Treehouse series. Andy and Terry have won numerous kids choice awards and many of their titles are nominated every year. The 13-Storey Treehouse, The 26-Storey Treehouse, The 39-Storey Treehouse, The 52-Storey Treehouse, The 65-Storey Treehouse, The 78-Storey Treehouse, The 104-Storey Treehouse and The 117-Storey Treehouse have all won ABIA awards. The 91-Storey Treehouse won the ABIA Audiobook of the Year in 2018 and The 52-Storey Treehouse also won the overall ABIA Book of the Year in 2015.