Two Civil War dime novels in one volume, both composed by a veteran of the conflict and published during the war. In the fall of 1861, Union forces in southwest Missouri are closing in on Confederate forces. Spies from both sides roam the rugged Ozarks, to see who will strike first and where. In The Border Spy, a Union soldier and his sister fall into the hands of a Rebel officer bent on revenge. Can their friends rescue them? In The Prisoner of the Mill, a Union officer vanishes and his best friend and his sister undertake a dangerous quest to find him.