From the liner notes

A woman is accused of witchcraft and put to death. Her older daughter knows the real reason is the Lord's sexual desire for her. She confronts him and is also killed. A younger daughter is spared and taken in by the killers. Once she is of age she is married to the Llord's worthless son. The older daughter mysteriously returns from the dead during a thunderstorm and begins to avenge her mothers murder. A Barbara Steele classic!!