Lucy Harbin goes berserk when she finds her husband in bed with another woman. With her three-year-old daughter accidentally witnessing the grisly act, Lucy axes the couple to death, then spends twenty years in a mental institution for the double murder. After she is released, she moves in with her brother, his wife, and her own daughter, now age twenty-three. Her nightmare is over, or is it? When a series of axe murders suddenly occurs in the neighborhood, the police think Lucy is to blame.