When Atticus receives a mysterious message asking him to a meeting in a sleepy coastal town, he packs his bags and sets off. The world's greatest cat burglar likes a good mystery and this time curiosity has got the better of him. The writer of the message, it turns out, is none other than Jimmy the Magpie, gang leader. He wants Atticus to steal all the jewels in town and leave the humans baffled. And what could be more straightforward? But when Atticus moves in with Inspector Cheddar and his family, he starts to wonder if a life of crime is really for him ...