A couple of days before her wedding, Wanda Maximoff receives notice that she’s the beneficiary of her Aunt Agatha’s estate, including a large, furnished house. Despite never having met her aunt, Wanda and her new husband, Vision, accept the house and settle into marital bliss. When they learn they are expecting twins, Wanda begins experiencing unsettling and unexplainable phenomena. Desperate to mollify her wild fears, Vision agrees to bring in a spiritualist to confirm the house is fine… except what is uncovered confirms Wanda’s worst nightmares. What seemed an idyllic life crumbles as they struggle to protect their unborn children from the demon Mephisto and the cult that worships him.