Andy and Terry live in the world's COOLEST treehouse! This gift slipcase contains the first three books in the internationally bestselling and hilarious Treehouse series, written by Andy Griffiths and illustrated by Terry Denton. There's lots of laughs at every level with all the building work Andy and Terry have been doing on their treehouse. They've built an anti-gravity chamber, a room for the boxing elephant called the Trunkinator and a marshmallow machine that follows you around and shoots marshmallows into your mouth whenever you're hungry! Just watch out for the sea monkeys, and the monkeys pretending to be sea monkeys, and the giant mutant mermaid sea monster . . .! Well, what are you waiting for? Come on up! The Treehouse Boxset - Level 1 is the perfect gift: it includes The 13-Storey Treehouse, The 26-Storey Treehouse and The 39-Storey Treehouse.