Ken Parker, with his mestizo friend Nick, is in South Dakota, where he pays homage to the Yankton Indians and their leader, Mahto, also to learn more about a beautiful black wild horse that he wishes he could capture. At the same time, in one of the tents of the Indian village, the young Otomi is trying to convince Fiore di Luna's father to give her in marriage. When Ken returns among his other two occasional adventure companions, he will discover that young Sid is also suffering from heartaches.
