Also Known As: Deep Red Hatchet Murders (1975), Dripping Deep Red (1975), The Hatchet Murders (1975), The Sabre Tooth Tiger (1975), Suspiria 2 (1975)

-"It's like having a madman in the house."
-Amanda Righetti's maid

A parapsychologist is brutally massacred in her apartment, from a mysterious assassin: the night before, during a lecture, the woman had perceived thanks to her powers, in the midst of the public, the presence of a person that had been soiled, a long time ago, of a horrible crime. In her ravings during a "trance" in front of the bewildered onlookers, she had also pointed to a distant "villa". Evidently the murderer, afraid of being unmasked from the revelations of this "sense," has covered her mouth forever by slaughtering her in a horrendous way. But the homicide spiral certainly doesn't halt here; nearby to the place of the crime two people howl at the desperate cries of the victim. There is Mark, a young jazz pianist only temporarily in Italy, and his friend Carlo (also a pianist, but one who plays his notes in a bar, and is drunk because of emotional discomfort that torments him continuosly). Mark (who lives in the apartment above the parapsychologist where the crime happens) runs to the building, and enters the house. There he finds the dead, dismembered body of the woman and blood everywhere. The murderer, however, has vanished.

Later, while the police are present, Mark is interrupted from a question, by a vision buried in his memory: when he entered the apartment of the victim, he saw on a wall a picture, composed of human faces. Now, he does not see it there. He believes this to be the key of the enigma.

Enter an imprudent and resourceful journalist, Gianna (who winds up falling in love with him.) Mark is forced to find the truth for fear that the maniac might have recognized him from the evening of the murder and may attempt to kill him as well. Numerous people, all able to determine the identity of the guilty, are killed as well. The protagonist discovers (or believes to discover) the murderer: his friend Carlo is responsible for the crimes, and while attempting to run away from the police, he is run over by a car and is dead. But when everything seems resolved, Mark has a kind of doubt: how can Carlo have killed the parapsychologist if that evening, while the spine-chilling cries of the victim were heard, the two were together? Mark runs again to the beautiful apartment where that assassination (the first of the long, inevitable chain), happened and finally, the secret in his subconscious returns to light: what he had seen in the corridor was not a picture, but a mirror - a mirror which had reflected the face of the assassin. The face of the mother of Carlo, a feeble but really monstrous creature, who had killed her husband twenty years before and walled up the body in the villa where they lived under the eyes of the small Carlo. She is in the apartment, ready to kill Mark. Though he is wounded, he defends hopelessly. However, the big metallic necklace of the woman becomes entangled in the grille of the elevator, and Mark starts to operate the elevator. The woman dies beheaded.