One of the peaks of the master Darío Argento, a dazzling and captivating masterpiece of horror cinema.

The young poet Rose Elliot finds an architect's old diary written in Latin in an antique store. In it, the existence of the Three Mothers of Evil is revealed, and Rose comes to believe that one of them lives in her building. Frightened, she calls her brother Mark and asks him to travel from Rome, where he is studying Musicology, to New York to be with her. But when Mark arrives in New York, it may already be too late...