A gentile sage-rider is about to be whipped by the Mormons to coerce the rich and beautiful Jane Withersteen to marry against her will. In desperation Jane whispers the prayer, "whence cometh my help!" Just then an unlikely hero, the infamous gunfighter, Lassiter routs the persecutors and is drawn into this conflict on the Utah-Arizona border. The mysterious loner hires on to Jane's ranch. Through battles with gun slinging cattle-rustlers, cut-throats and the calculating Mormons, Lassiter unveils his tale of an endless search for a woman abducted long ago. Grey unfolds his story of seduction, secrecy, captivity and escape on the dust swept purple plains.