- A troubled priest attempts to exorcise the soul of a tourist who has been possessed by the Devil after witnessing supernatural events at a Spanish villa.
- Tourist Lisa Reiner faints on the street and is taken to hospital. She shows disturbing signs of demonic possession, so a priest, Father Michael, is brought in to perform an exorcism. However, he first tries to investigate how she became possessed by the devil in the first place. Despite the fact that her personality has now completely blended together with the demonic entity within her, she none the less tells him about the horrific experiences she lived through in the mansion of a twisted Spanish aristocratic family with a dark secret and the devil she met there.
- Lisa Reiner (Elke Sommer) is a young American woman vacationing in Spain with some friends of hers. During a stop in a small town square with her tour group, Lisa grows to admire a fresco of the devil carrying a dead man's body which her tour guide describes as the devil carrying away lost souls back to Hell. As her group disperses, Lisa hears a beautiful piece of music. She leaves her companions and traces its source to an elaborate music box in a little antique shop just outside the main square. While inside the shop, she encounters a strange man (Telly Savalas) purchasing parts of a life-size mannequin. After making eye contact, Lisa is startled when the man bears an uncanny resemblance to the devil depicted in the painting. The man's peculiar behavior distresses Lisa, so she flees from the shop to rejoin her friends.
Soon after, Lisa is struck down by a violent seizure, while the other tourists gather around her. A priest named Father Michael (Robert Alda) approaches and accompanies Lisa and her tourist friend (Kathy Leone) to a local hospital while the EMT's sedate her.
At this point, the film switches back and forth between two difference time-lines involving Lisa's adventures, and the possessed Lisa in contemporary time at the local hospital.
In the alternate time line, Lisa becomes hopelessly lost in the maze of backstreets of the town. Though she has only walked a short distance beforehand, the back streets and alleyways seem totally alien to her. The locals refuse to give her directions, as side streets lead to dead ends. Lisa runs into the mysterious man a second time, though this time he is carrying a full-length, life-sized mannequin eerily similar to the painting depicted in the main square, as well as carrying the music box still playing the haunting tune. Introducing himself as Leandro, he gives Lisa some vague directions back to the main square, then walks around a corner and disappears. But the direction that Leandro points to the main square leads only to more unfamiliar streets. Next, Lisa encounters a strange man who looks a lot like the mannequin that Leandro was carrying. These bizarre coincidences begin to terrify Lisa, and the stranger acts as though she is his long-lost lover. Frantic, Lisa pushes him away and the man falls down a flight of stone steps, apparently dead. Lisa runs off in a panic.
In the other time line, Father Michael and Lisa's friend are at the hospital and hear Lisa growling and cursing at the orderlies who try to restrain her. Father Michael suspects that Lisa may be possessed by a demon and urges her friend to leave while he keeps an close eye on Lisa. Father Michael enters the room where Lisa is where she yells at him and that he "smells of incest".
Back in the alternate time line, night falls on the village, and Lisa remains lost. However, her luck seems to be improving when she hitches a ride in a old vintage 1940s limousine which contains Francis Leher (Eduardo Fajardo) and his wife Sophie (Silvia Koscina) whom are driving through the village with their chauffeur George (Gabriele Tinit). But their limousine soon breaks down just outside a old villa on the town's outskirts. The four travelers push their car into the villa grounds and knock on the front door asking for assistance. The villa turns out to be occupied by an elderly blind countess (Alida Valli), and her neurotic son Maximilian (Alessio Orano). When Maximilian spots Lisa, he becomes convinced that she is the reincarnation of a woman that loved and lost. Maximilian implores his mother to allow the four stranded tourists to stay for the night while he helps the chauffeur repair the car's engine. Though the villa is well-appointed, it has a strange atmosphere. Lisa is subsequently shocked to discover that Leandro is the family butler, who also recognizes her from their brief meetings earlier, and seems a little too friendly to Lisa.
At the hospital in the other time line, Father Michael talks to the doctor examining Lisa about her condition. Father Michael enters Lisa's room again where she is tied down to the bed. The troubled priest tries to communicate with the possessed Lisa who only insults him more and begins to describe a house which great evil resides.
Back in the other time line, as Leandro settles Lisa, Francis and Sophie, and George into their living quarters for the night, Lisa jumps with fright when she sees the same man from the village who tried to attack her, staring at her through the window. Lisa tries to get away from the house, but her departure is thwarted by Maximilian, who begs her to stay. As she feels some attraction to the young man, as well as pity for him, Lisa relents.
In the contemporary time line, the possessed Lisa is retrained by the doctor and other orderlies in another room while Father Michael watches with interest.
In the alternate time line, the four travelers are settled down to dinner, while the food is served by Leandro. Lisa further notices the weird atmosphere of the place, when Maximilian continues to remind Lisa that she has a resemblance towards his lost lover, Elena. But Francis and Sophie's relationship becomes more strained as dinner progresses. Francis' cold, dispassionate nature forces Sophie to walk away from him, and she falls into the arms of George, whom they have quick passionate sex. A short while later, George is found dead, with a pair of scissors plunged into his throat. Sophie immediately assumes that her husband did it, and she flees outside into the car where she starts it up, When Francis comes out to stop her from leaving, she runs over him over and over again. But upon returning into the house, Sophie is killed by Maximilian in a hurtful, gory way. It was Maximilian who murdered the chauffeur to prevent Lisa from leaving.
In the contemporary time line, Father Michael sets about to try to exorcise the evil spirit from the possessed Lisa who (serving as a type of narrator) recounts her experiences at the mansion in the alternate time line by describing the stories about murder, incest, adultery and Satanism. She begins to vomit up green-colored slime that turns into living toads.
In the alternate time line, Maximilian turns his attention to Lisa where it's revealed that the man who pursued Lisa in the village is actually Maximilian's stepfather Carlos (Espartaco Santoni). Like Maximilian, he had previously fallen in love with Elena, the woman displayed in a few old photographs who bears an amazing resemblance to Lisa. Carlos had abandoned the countess and ran off with Elena, who was also Maximilian's lover. Before she had a chance to join him, Maximilian had murdered Elena and stored her body in a concealed room so he could continue to have her, even in death. Apparently when Carlos returned to the village, he assumed after seeing Lisa that she was Elena. Now that Maximilian had murdered Carlos, he puts him display in an open coffin in the parlor so that nobody can take Lisa away from him.
In the time line back at the hospital, the possessed Lisa tries to taunt and break down Father Michael by turning into a brunette, nude woman named Anna, whom Father Michael had an affair once.
In the alternate time line, when Maximilian decides to share his secret with Lisa about his lost love Elena, he takes her to the concealed room, and shows her Elena's skeletal remains, Lisa finally then backs away in horror and rejects Maximilian. But rather than kill her, he chloroforms Lisa and puts her in the bed next to Elena's remains. Maximilian strips Lisa naked and tries to have sex with the unconscious woman. But in his twisted state of mind, he feels that the skeletal remains of Elena is mocking him and he cannot perform. Apparently deciding that in order to consummate the relationship, he will have to marry her.
Maximilian meets his mother in the parlor who's paying respects to her dead husband where he tells her of his intentions. The Countess, jealous of the hold Elena, in the form of Lisa, continues to hold over the men in her life, demands that Maximilian kill Lisa and dispose of her and the rest of the bodies before the police show up looking for her and the other murder victims. But Maximilian's devotion to Lisa is complete, and rather then get rid of her, he stabs his mother dead as she stands by the coffin that contains Carlos' body.
All of these events are observed by Leandro, whose presence seem to haunt the villa, and who seems to be orchestrating the bizarre occurrences as some kind of sick game. Unsettled by this act of matricide, Maximilian rushes about the house looking for Leandro who, for once, is nowhere to be found. Instead, Maximilian finds the bodies of all his victims, including the skeletal Elena, seated at the dinner table looking at him. He turns around and sees his undead mother shambling towards him. In shock, Maximilian recoils backwards, only to fall out a second floor window, and onto the spikes of a gate. Emerging from behind the body of the dead Countess, Leandro remarks, "oh, it slipped".
The next morning, Lisa wakes up, naked and in unfamiliar surroundings. Though it seems to be the exact same concealed room, it is now infested with vegetation and she is alone with no bodies anywhere. Putting her clothes back on, Lisa walks through the house and finds that its entirely deserted. In fact, it looks that nobody has lived in the house for a long time. Confused, but somewhat relieved that the entire night's experience was apparently nothing but a bad dream, Lisa leaves the house and runs into a group of schoolgirls playing ball in the street. The balls rolls in her direction and she catches it. One of the the girls points to Lisa and proclaims her a ghost because nobody has lived in the villa for a hundred years. The girls run away screaming. Lisa walks around a little and within minutes finds herself back in the town square from the beginning of the movie. She is observed by Leandro a short distance away who is being given a mannequin likeness of her.
In the final scene, Father Michael arrives at the abandoned mansion where the possessed Lisa described. Father Michael attempts to perform an exorcism on the house, but winds strike him and he gets struck down and blown up by evil lighting, paying the ultimate price for his naivety.
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By what name was The House of Exorcism (1975) officially released in Canada in English?
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