| Cast overview, first billed only: | |||
| Leigh McCloskey | ... | Mark Elliot | |
| Irene Miracle | ... | Rose Elliot | |
| Eleonora Giorgi | ... | Sara | |
| Daria Nicolodi | ... | Elise De Longvalle Adler | |
| Sacha Pitoëff | ... | Kazanian (as Sacha Pitoeff) | |
| Alida Valli | ... | Carol, the caretaker | |
| Veronica Lazar | ... | The Nurse / Mater Tenebrarum | |
| Gabriele Lavia | ... | Carlo | |
| Feodor Chaliapin Jr. | ... | Professor Arnold / Dr. Varelli (as Feodor Chaliapin) | |
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Leopoldo Mastelloni | ... | John, the Butler |
| Ania Pieroni | ... | Music Student | |
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James Fleetwood | ... | Cook |
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Rosario Rigutini | ... | Man |
| Ryan Hilliard | ... | Shadow | |
| Paolo Paoloni | ... | Music Teacher | |
Riddled with secret but horrid suspicion, the young American poet, Rose Elliot, writes to her brother and musicology student in Rome, Mark, about the startling findings in the dark and dank basement of her New York Art Deco apartment building. Pivoting around the cryptic knowledge hidden in the leather-bound book entitled "The Three Mothers", Rose is convinced that her aristocratic but damned abode is, in fact, an ancient coven for Mater Tenebrarum, the malevolent Mother of Darkness. Little by little, as the siblings delve deeper and deeper into the occult, a mysterious disappearance and an endless string of gruesome killings will bring Mark closer and closer to a surreal nightmare. Where do the long and shadowy corridors of Rose's building lead? Written by Nick Riganas
Dario Argento is a master of his genre, no doubt about that, but his script here is pure hokum. The film has a number of striking images (the mysterious beauty that appears out of nowhere in the classroom; the drapes being slowly ripped apart by the nails of a stabbed-to-death woman; the close-up of Daria Nicolodi's lips; the pursuer at the library's basement, whose face remains in the dark, but whose hands are clearly not human), and a very peculiar architectural design, with secret passages leading to all sorts of hidden rooms to other passages to other rooms....However, as many others have said, the film is best approached as a dream, because the plot is incoherent and there are several scenes that run on too long. It does get better on the second viewing. (**)