Andy and Terry have expanded their tree house! There are now thirteen brand-new stores, including a dodgem-car rink, a skate ramp, a mud-fighting arena, an antigravity chamber, an ice-cream parlor with seventy-eight flavors run by an ice-cream-serving robot called Edward Scooper hands, and the Maze of Doom - a maze so complicated that nobody who has gone in has ever come out again . . . well, not yet anyway . . .