What today is an obvious mash up of Rosemary's Baby and Repulsion (complete with Mia Farrow clone) was a clever cash in on a then fresh genre. It's predictable, unoriginal and somewhat stale, but it's also one of the more lavish and well-crafted Italian giallo. It's not the best of the countless Occult horro films that came out of Europe but it's far from the worst.