The forest’s police chief Gordon is about to retire and he needs to find a new assistant. Paddy, a clever mouse with a great sense of smell seems to be the right candidate. Together they have to solve Gordon’s last case – the mystery of squirrel’s missing nuts. Could it be the fox that took them? Gordon and Paddy will soon find out. But as soon as he has sworn Paddy in she finds herself facing her first challenge: two young animals have gone missing and the others are in a panic. Will Paddy be a match for the fox?