Gringo Paleface, bandit, robber and highwayman, terrorizes the mice of FlatFoat-Valley - but not for long. The daring mouser Big Joe shows him the ropes. Out of gratitude, they make him sheriff. From now on, the mouse sheriff has his hands full; on duty he has to deal with scoundrels, Indians and wild animals, in his private life he has to decide between Cat Minou and Marieluise Pappkarton. And Fränkie Hosenfeld, the president, also secures his services.