Billy Slipper is a fairly normal boy with a not-so normal family. All he wants to do is add to his 'Collectabillya' (an assortment of weird and wonderful objects) in peace, but his cleaning-mad mum and his horrid twin sister have other ideas. However, they don't bargain on Billy finding his best ever Collectabillya - Jumblecat! Jumblecat is... well, a jumbled-up cat (who talks, by the way), and he's set to change their lives forever.