Sylvia (Mimsy Farmer), an industrial scientist, is troubled by strange hallucinations related to the tragic suicide of her mother.
After the success of "Rosemary's Baby" (1968), the Italian horror world began to embrace Satanic and occult stories. This is one of them. Director Francesco Barilli took a cue from early Argento and made a giallo with some dark undertones. He previously wrote a script for Umberto Lenzi, but had not directed a feature himself.
The cast may not be well-known outside of Italy, but have appeared in Lenzi, Argento and D'Amato films. One even appeared in the notorious "Salo", and a few starred alongside Daria Nicolodi in a picture. So there is plenty of connection here.
This film is beautifully shot with excellent color and better than average acting. It deserves more recognition than it gets. Wikipedia and IMDb are relatively silent on the film's creation, and even Italian horror historian Luca Palmerini has little more than a sentence to say about it in his book...