When Little Beaver and Po-Ko are allowed to come along to a gathering of Indian leaders in Tucson, they meet Tonio, who takes the pair to his mother's ranch. While on the ranch the trio discovers the camp of a gang who have been stealing young boys to work as slaves in dangerous underground mines.; While baby-sitting Po-Ko's little cousin Big Elk, Little Beaver and Po-Ko come across two white men who are stealing Navajo sheep.; Description of Indian sign language.