Rancher Calvin Wood becomes the victim of brutal outlaws who are terrorizing a remote district of Arizona. On his arrival from England, young Brad Wood undergoes a dramatic transformation when he travels to Calvin's ranch, only to find his cattle have been stolen, and his brother's hanged body. He changes from a feckless waster into a fighting man able to stand up to the rigours of the West. Assisted, and sometimes led by his overweight but ingenious manservant, Merridrew-who reveals sterling qualities-Brad seeks to avenge his brother's murder and beat the mysterious raider who seems bent on destroying every ranch in Double-Peak valley...