After a tragic car accident that took their grandson's life, Audrey and Henry are unable to go on without him. Following the guidance of their ancient spell book, the elderly couple decide to abduct a young pregnant woman with the intention of performing a "reverse exorcism" to channel their grandson's spirit inside her unborn child. But when it becomes clear the ritual has called upon more than one spirit, the couple realize they have summoned more than they bargained for and must put an end to the evil entity they've invoked.