Arrietty Clock and her parents Pod and Homily are forced to move. They temporarily move in with Homily's sister, Lupy, but they don't like it at all. Arrietty can't get along at all with her two annoying cousins Ditchley and Ilrick. They decide to leave Homily's house and head into the wilderness. Here they run into the bum Spiller, an old friend of Arrietty's. He sends them to an old miniature city, where they take up residence for the time being. Thus they meet their old human friend George, but unfortunately also their old enemy, the terrible lady Mrs. Driver.