The fox became a fox, meaning cunning and astute, when it fell from a cloud. Since then, it has kept one eye on chickens, and the other on the vulture: like the colliers. Why wear oneself out in the forest, when there are so many unwary travellers on the mountain, with full bags? Sometimes man, sometimes fox; sometimes collier, sometimes highwayman...this is how the Aizkorri colliers live, with Barriola at the head, the great fox. Yet their lives are not worry-free: Barriola has wooed a little chicken named Graziana...and unexpectedly, the mayor of Segura suggests they rob on other highways, which would be most appealing for the municipal coffers.