Mark Justice's The Dead Sheriff: Purity

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The Master's Hellspawn-Since acquiring the magic amulet, the half-breed Sam has used it to re-animate a murdered lawman thus creating the Dead Sheriff. To maintain the fabrication of a zombie avenger, he adopted the role of Cheveyo, the Dead Sheriff's loyal Indian companion. Together they roam the west hunting outlaws and supernatural monsters accompanied by Richard O'Malley, a Boston journalist looking to chronicle their adventures in dime novels.- The amulet was once the property of a New Orleans mystic known as the Master and he wants it back. To that end the Master recruits a sadistic arsonist named Perdifious who believes himself Satan's own Hellspawn and has gathered together an army of savage, sadistic killers. They wreak havoc and destruction wherever they go and their next destination is a Quaker settlement named Purity. Learning of this, Sam, the Dead Sheriff and O'Malley plan to confront them there and save a town full of non-violent pioneers.