The Hunt-U.S. Marshal series continues with fresh and exciting adventures for Hunt and the other U.S. Marshals assigned to the Denver office. Hunt and Earl are sent north to investigate the disappearance of two army scouts and are escorted to the Sioux camp by cavalry officers from Fort Carson. Hunt's visit is complicated with the arrival of a man from Philadelphia claiming his daughter is being held against her will at the Sioux camp and is demanding that the army help him retrieve his daughter. Hunt comes face to face with the man that he tracked all the way from Boston to the Missouri River with surprising results.