In Arizona during the Civil War, a woman is accused of witchcraft, tied to a horse and left to die in the desert. One hundred years later, the descendants of the woman's accusers start being killed off, and the townspeople suspect the woman has come back as an evil spirit.

A determined TV reporter is out to find a maniac who is methodically attacking lone women drivers on the Los Angeles Freeway by pushing them off the road with his powerful van.