Max is a young dog with a top job - he's a police dog! He lives in the village of Moorside with twins Liam and Becky Wilson - and their dad, Sergeant Wilson. With Becky's brain, Liam's luck and Max's skill at sniffing out crime, the mysteries of Moorside are about to be solved!In this book: It's the annual football derby between Moorside and the neighbouring village Turnsville - and there's a problem for Max: the cup's been stolen . . .