It's the young Republic of Texas' worst nightmare, as the scattered Comanches have united under a single warrior chief to ready a campaign of carnage. Only one man can turn back this tide of bloody terror--John Henry McAllen, head of the ragtag volunteer force, the Black Jacks. Now these legendary troopers of the 1840's face the ultimate test--riding to meet the greatest challenge of all, while at their backs, the weapons of betrayal take deadly aim.