The Devil's Mistress (1965)

So young...So bewitching...So Evil!

A bewitching and beautiful Indian half-caste, Liah, takes her revenge on four ruthless cowboy desperadoes who have gunned down her husband for the sheer joy of killing. Using her enigmatic charm in a way that is fatal to the outlaws, the haunting young woman's vengeance is melted out in a strange, occult manner.