Andy and Terry have added 13 new levels to their biggest treehouse yet, including: an electric pony stable, a kangaroo-riding range, a whatever-weather-you-want dome and a hall of funhouse mirrors, which is a perfect place to hide from the school truancy officer who's trying to catch them and make them go to school!
But Anti-Andy, Terrible Terry and Junkyard Jill - their trouble-making opposites - are trapped in one of the mirrors, and they want out! (Oh, and Mr Big Nose wants them to write another book ... or else!)
Can Andy and Terry avoid school, defeat their doppelgängers and get their book done in time?