Frightmare

After spending nearly twenty years in jail for a series of cannibalistic murders, Dorothy Yates and her husband Edmund, who was jailed for his attempted cover-up of his wife's ghoulish tastes, are apparently cured and released back into society. Their two daughters are haunted by the fiendish deeds of their ghastly parents, and soon the killings begin again. But is it Dorothy this time, or someone else? (official distributor synopsis)