Not final jacket image Andy and Terry live in the WORLD'S BEST treehouse! It's got a giant catapult; a secret underground laboratory; a tank of man-eating sharks 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 . . . Oh; and; whatever you do; don't get trapped in a burp-gas-filled bubble . . . ! Andy Griffiths and Terry Denton's fantastically funny The 13-Storey Treehouse is told through a combination of text and cartoon-style illustrations.