Fat Jemmy and Long Davy come across the young Indian Wohkadeh. He is on a mission to report to Martin, the Son of the Bear Hunter, that his father has been captured by a Sioux band. He and his are to be sacrificed at the stake in a valley at Yellowstone, where Old Shatterhand once killed three Sioux in duels. Jemmy and Davy, together with Martin, Hobble-Frank, the Bear Hunters assistant, and his servant Bob set out to liberate the Bear Hunter. On route they meet Old Shatterhand and Winnetou who join in their venture. Subsequently, the group fights a band of Shoshone and Upsaroca, but turns them into friends and allies. After much strife, the capture of the five original friends, and a vivid description of the wonders of Yellowstone, everyone is freed at Yellowstone and even the defeated Sioux are turned into friends.