"This great county was reeling after a bloody Civil War and rife with the rush to rebuild and, finally, settle the West. in the midst of the turnmoil, young cavalry officer Carlos Quintana is thrust into the spotlight of a national hero, after he saves President Johnson from an attempt on his life. Plots of daring and intrigue happen as the ever-expanding U.S. government sends Quintana and his men on secret and dangerous missions such as going after the Quantrill Gang, putting down a Mexican rebellion in Texas and escorting wagon trains of Mormons through hostile territory. Durning this time he is dogged by a relentless US Marshal determined to bring Quintana to trial for a double murder. Quintana's adventures take him home to Missouri country, but his work turns personal when his brother is murdered and he must hunt down the killer."