The news wasn't good: the kill-crazy McClory brothers had busted out of Yuma Pen and were headed for Indian Territory. Somebody would have to bring them in and the job falls to Liberty Mercer, a US deputy marshal who also happens to be a woman. And she was getting mighty tired of having her abilities questioned time and again. Liberty sets out to run the outlaws to ground, knowing it is going to be tough. But even she never anticipates just how tough it is going to be. As she follows a trail of bodies clear across the desert known as The Devil's Anvil, she forms an uneasy alliance with the Dunn brothers, Bill and Bee. Along the way she almost gets herself killed for trusting the wrong person, but by the time the gunsmoke clears she will learn something about herself that will change her whole life.