Journey of the Dead by Loren D Estleman

In Loren D. Estleman's Journey of the Dead, when Pat Garrett killed his poker buddy, Billy the Kid, he had no idea what a terrible emotional price he would pay. Haunted by memories of Billy, Garrett wanders the New Mexico desert in a fruitless pursuit of peace.
Deep in the same desert, an ancient Spanish alchemist searches for the fabled philosopher's stone. Resolutely alone in his quest he devotes his long life to hunting the secrets of the old gods.
As these two men seek answers to questions that have confounded mankind for centuries, their stories encompass the panorama of American history. This journey from wild frontier into the twentieth century is an unforgettable experience.
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