Clay O'Mara (Audie Murphy) vows to bring justice when his father and brother are murdered by cattle rustlers. What he does not know is that three of the most prominent citizens of Santiago are behind the crime including the town sherrif, Fred Kenyon (Paul Birch). As part of his duplicitous plan to eliminate the remaining O'Mara heir, Kenyon deputizes Clay and sends him off to capture Whitey Kincade (Dan Duryea), a notorious, trigger-happy outlaw who is suspected of the murders. Instead of killing each other in a shootout, however, Clay and Whitey become worthy adversaries who forge an unlikely alliance in uncovering the truth. Ride Clear of Diablo is a classic revenge western and is enlivened by Dan Duryea's scene-stealing performance as the unrepentant, devil-may-care Whitey and a superior supporting cast that includes Susan Cabot, Russell Johnson, Abbe Lane, Jack Elam and Denver Pyle.