Londoners George and Nell Gregson (Egan, Franklin) pull up to a well-kept estate in the English countryside that they have decided to look at. Upon arrival, they are met by The Estate Agent (Whitehead), who shows the couple around. He adds that the house has been well cared for, but uninhabited since 1935. The Estate Agent proceeds to explain why.
1927
Henry Smith, a wealthy American Ex-Pat (Price), and owner of the estate invites his friend, the British film director Emmit MacPherson (Hendry) to his estate for the weekend. Also present is Victoria (Lumley), Henry's much younger wife, and the butler Durand (Villechaize).
Unknown to Henry, Victoria has been having an affair with Emmit. The pair hatch a plan to murder Henry. Durand realizes what the pair are up to and tries to warn Henry. That night at dinner, Henry is poisoned after taking a sip of his wine. Before dying, Henry swears his revenge.
1975
George and Nell don't seem particularly phased by the story. In between their own bickering, the Estate Agent continues to show the pair around, telling them another story. He also shows them pictures of the people allegedly involved.
1932
Three years later, Emmit and Victoria are happily married and living on the same estate. Durand is their butler. Durand despises Emmit but believes Henry will come back for revenge as promised. One night, Emmit and an expectant Victoria are returning home from a party. Their driver sees a man on the road who a horrified Emmit and Victoria recognize as Henry. The driver swerves, causing the car to crash. The driver and Victoria are killed, but Emmit manages to survive.
1975
George tells the Estate Agent that he doesn't believe in ghosts and that the car likely just crashed. The Estate Agent goes on to tell the couple another story, pulling out a picture of a man he describes as Charles Grayson, a Hollywood screenwriter.
1933
A year after Victoria's death, Emmit, now walking with a pronounced limp, is in Hollywood directing a screwball comedy. He becomes friendly with the young, carefree writer of the screenplay, Charles Grayson (Walker). Charles lives with his fiance, aspiring actress Francine Williams (Woronov), who can't get beyond chorus girl in musicals. Francine takes a shine to Emmit and the two start an affair behind Charles' back. A guilty Francine eventually decides to break things off with Emmit, but he gets jealous and strangles her to death. Making it look like a murder, Emmit consoles a grieving, unassuming Charles.
1975
George and Nell think the stories are far-fetched and George especially doesn't appreciate The Estate Agent trying to frighten them with nonsense. The Estate Agent tells them he has one more, long story that will shock them.
1935
Two years later, Charles travels to England for a weekend visit to Emmit's estate. Upon arrival, he is greeted by Durand. Charles is led into a drawing-room where he meets Hollywood actress Celeste Logan (Kidder), stunt pilot and aviator Skip Billingsley (McHattie), and stage actor Oliver Evans (Valentine). Emmit appears greets his guests for the weekend and Durand shows them to their rooms. Charles starts unpacking and notices several old suits in the closet of the room he is staying in, which Durand tells him was the room of the previous owner.
Emmit stops by Charles' room to discuss a screenplay he wants him to write, another comedy. Charles tells Emmit that he no longer writes comedy and has switched to tragedy, noting that the move hasn't really helped his career much. Emmit says they can discuss the matter after dinner.
The dinner conversation is rather dull. Charles, who has taken to drinking to hide his pain, becomes tipsy. Emmit tells the group that after dinner he has a surprise in his private screening room. He shows them a print of his latest film, a romance which stars Celeste and Oliver as the leads. Emmit asks Charles what he thought of the film. A drunken Charles tells him it was miserable. Emmit doesn't look too pleased with this response.
After the film, the guests minus Emmit all gather in the drawing-room. Oliver has brought a ouija board and is eager to use it. Charles decides to go along with it. Celeste tells them she's disturbed by the idea of communicating with the dead and declines to take part, leaving just Charles, Skip, and Oliver.
Skip gets frightened and decides to leave, venturing outside. Durand spots the two men using the ouija board and warns them they don't know what they are messing with, that the house is haunted. Oliver laughs it off and tells Charles to continue. Halfway through the ritual, the power briefly goes out. Charles tells Oliver he feels dizzy and proceeds to pass out.
Meanwhile, outside, Skip runs into Celeste and the two start talking. Celeste tells Skip she's seeing Emmit but thinking about breaking things off due to his controlling nature.
Meanwhile, Charles comes to with help from Oliver and Durand who has brought smelling salts. Charles says he feels a bit odd. Oliver and Durand help him upstairs.
Sometime during the night, Charles gets up. He looks in the mirror and for a flickering second sees a face that is not his. (Unknown to Charles, he just saw Smith's reflection rather than his own). He blacks out again. Somehow, Charles wakes up in his guest room the next morning with no recollection of how he got back there. Frantic, he goes to look in the mirror seeing his own reflection. Charles goes to get dressed and notices that all of the clothes he brought are mysteriously missing. He has to resort to wearing one of the old suits in the closet. Upon his arrival for breakfast, Emmit looks disturbed to see Charles wearing the suit. Charles explains that he had no choice, the clothes he brought were stolen.
After breakfast, Charles pulls Durand aside and asks him about the previous owner. Durand leads Charles to his quarters where he shows Charles a photograph of Henry Smith. Charles is horrified to realize that Smith is the man he saw in the mirror.
Durand leaves via bicycle to town where he meets up with the local Priest, Father Bailey (Sim). Durand tells Bailey what has happened and the two suspect that Charles might be possessed by the spirit of Henry Smith.
Meanwhile, Charles goes out for a walk with Oliver. Deep in the woods, Oliver sees what appears to be Charles' luggage. The two begin to pick the items up when Charles blacks out. Charles starts talking differently (in Henry's voice) and he becomes violent towards Oliver. Oliver starts running back towards the house, but Charles (as Henry) tackles Oliver and strangles him to death.
Back at the house, Skip asks Celeste if she would like to see the plane he flew himself to the estate in, to which she obliges. As they head outside, a disheveled Charles wanders towards them and passes out.
Charles regains consciousness. His last memory is going for a walk with Oliver, who nobody has seen for hours. Skip offers to go look for Oliver. Father Bailey, who has arrived on the lot stays with Charles, while Celeste sits in the drawing-room with MacPherson and Durand.
Charles blacks out again and awakens, talking in Henry's voice and cursing the Father. Father Bailey notices that Charles' reflection in the nearby mirror is not his, but the man he remembers as Henry Smith. The shock is so great that Father Bailey suffers a heart attack and collapses.
MacPherson and Durand run upstairs to find Bailey collapsed on the floor in Charles' room. Once again, Charles is comatose. Durand pronounces Bailey dead and goes to make a call. The power suddenly goes out. Skip returns, telling the others that Oliver is dead. Durand and MacPherson tell Skip and Celeste Father Bailey is also dead, an apparent heart attack.
Durand confronts MacPherson as an awakened Charles, wearing one of the suits and otherwise looking fine, calmy walks down the staircase. He starts talking in Henry's voice again, which causes MacPherson to snap. Durand forces MacPherson to admit to his crimes. MacPherson admits everything and then in a fit of rage stabs Durand to death. Charles/Henry then turns on MacPherson as a horrified Skip and Celeste look on.
After MacPherson is shot to death, Charles passes out again and awakens as himself, with Henry's spirit presumed to have crossed over. Skip and Celeste, knowing Charles was merely acting as the host, try to console him. However, he heard MacPherson's confession and knows he committed murder, even if he was possessed. A distraught Charles gets up and shoots himself. The others dead, Celeste and Skip escape in Billingsley's plane.
1975
The film returns to the present. The caretaker explains that the two survivors later married, but both met tragic ends. Celeste's career faded quickly, and after Skip died in an airplane accident, Celeste went completely insane, later dying in a mental hospital. George and Nell tell the Estate Agent that they don't believe most of the stories and that they will still take the house.
Sometime later, George and Nell have moved into the estate. They have a dinner party with friends, and for laughs, George hauls out a ouija board, telling the guests the crazy stories they were fed about the house.
That night, after the guests leave, George is in the bathroom getting ready for bed when he looks into the mirror and is horrified to see his reflection replaced by that of Charles Grayson.
THE END