After several puzzling events, Jillian begins to have doubts about her husband, suspecting he's not the same man she married. Concerns about her unborn twins arise. The first half went well. But, second half dragged. However, on the plus side, it reminded me of Rosemary's Baby .
Husband is really demonic, other worldly.
Wife learns horrible truth about her pregnancy. She moves to New York with him, of course. The film demonstrates the close parallel between hostile outer space aliens and spiritual demonic forces, in the mind of our popular culture. The film plays on our fears of being over come by forces greater than ourselves. It reminds us that we can not entirely chart our own course.