During the years of unrest that followed the civil war, a powerful, secret organization called the Legion of the Black Arrows sprang up in the western United States. Its members were to be found everywhere, defying the law or using the law for their own purposes, working towards the ultimate goal of revolt against the foundation of a despotic empire. It was the masked rider of the plains who led the fight against this band of outlaws and traitors, and for once his great strength and courage; his daring and resourcefulness were taxed to the upmost in the cause of democracy...