Federal Deputy Sullivan Hart arrived too late to rescue his father. But the elder Hart managed to identify his killers before his death - by scrawling the phrase Los Pistoleros in his own blood.

Since the end of the Civil War, this outlaw gang has been involved in everything from cattle rustling to running guns - without getting caught. Sullivan Hart aims to end that lucky streak.

But Sullivan isn't the only man on the hunt. Quick Charlie Sims, gambler and con man, has his own debt to settle with Los Pistoleros. And he's got to do it without letting lawmen like Sullivan Hart get involved. Because Charlie Sims is a wanted man, too . . .