 In this serial, Wild Bill Tolliver and Missouri Benson are a pair of adventurers who ride into the vast New Mexico Territory in search of Bill's father, Henry Tolliver, who mysteriously disappeared while prospecting for gold.They soon discover that a ruthless outlaw leader, Jonathan Kincaid, owns an immense mine of gold in which he uses captured Mexican patriots, among others, to work as slaves in the mine.They also learn that Kincaid has joined forces with Colonel Carl Engler, a renegade eastern European soldier, to carry out his cruel intentions.