Cyril is the only squirrel in Lake Park, and he's very lonely. Until one day he meets Pat – Pat the big, grey . . . other squirrel. Cyril and Pat have lots of adventures and fun together and Cyril is so pleased he's made a friend. But everyone is adamant that Cyril and Pat simply cannot be friends, and they soon reveal why: Pat, as the reader has known all along, is actually a RAT!