Andy & Terry live in the WORLD'S BEST treehouse! It's got a giant catapult a secret underground laboratory a tank of man-eating sharks & a marshmallow machine that follows you around & shoots marshmallows into your mouth whenever you're hungry! Just watch out for the sea monkeys & the monkeys pretending to be sea monkeys & the giant mutant mermaid sea monster Oh & whatever you do don't get trapped in a burp-gas-filled bubble! Andy Griffiths & Terry Denton's fantastically funny The 13-Storey Treehouse is told through a combination of text & cartoon-style illustrations