Eye of the Devil, also known by its working title 13 or Thirteen, is a 1966 British mystery horror film directed by J. Lee Thompson and starring Deborah Kerr, David Niven, Donald Pleasence, Sharon Tate and David Hemmings. Based on the 1964 novel Day of the Arrow by Robin Estridge, the movie is set in rural France. It was shot at the Château de Hautefort and in England.

Plot

Philippe de Montfaucon, Marquis de Bellenac, (David Niven) hereditary owner of an ancient estate in Bordeaux whose vineyards have produced no fruit for three years, lives in Paris with his devoted wife Catherine and two young children. He is abruptly summoned to Bellac, where a sinister priest (Donald Pleasence) gives him a strange amulet. After their son, Jacques, dreams that his father needs him, the Marquise (Deborah Kerr) takes their children to the chateau. When they arrive, archer Christian de Caray (David Hemmings) shoots a dove, which falls at Catherine's feet. Questioned, Philippe's Aunt Estelle observes that Christian is “a very wicked boy” and his sister Odile (Sharon Tate) is “no better.” She dismisses Catherine, telling her maid “This time, I can't be involved.”

Eye of the Devil

Late at night, Catherine discovers Odile and Christian ceremoniously carrying the impaled dove into a candlelit room where robed figures sit. They present the dove first to an altar whose cross resembles the amulet and then to the figure sitting at the head. The doors close in Catherine's face, and an old man warns her to take her children and never return.

Eye of the Devil

Philippe dismisses Catherine's concerns—the valley is steeped in ancient superstition. He speaks of his family's 1000-year history in Bellenac: He has grave responsibilities. His Aunt tells him she would “rather die” than “say anything” to Catherine, and begs him to flee. Meanwhile, Odile enchants Jacques by changing a toad into a dove.

Eye of the Devil

A family friend, Jean-Claude, helps Catherine discover the Montfaucon history: 22 heads of the family have died in “mysterious circumstances”, going back to the 1200s. Meanwhile, Philippe visits the blighted vineyards and returns to learn that Catherine has ridden out to the tomb of Edouard de Montfaucon. There she finds a carving matching a painting in the chateau and an inscription referring to twelve dancers. Emerging from the mausoleum, she is pursued by robed figures, faints, and revives in her bed. Philippe gives her a sedative and kisses her. She wakes from nightmares to find herself locked in. Breaking open the window shutter, she signals Estel, who sends her maid.

Catherine wakes, and all is normal. The doctor tells her she was given belladonna, a hallucinogen. The community is celebrating “Les 13 Jours”. People fill the church, where Père Dominic prays in Latin. Philippe kneels alone; Estelle and the children sit in the front pew. Philippe pauses when he sees Catherine, but the priest repeats “Procedamos in pace” (Proceed in peace). Outside, 12 robed figures form a circle in front of Philippe and sway from side to side. Philippe kisses Jacques; the crowd gasps. Philippe welcomes all to the Festival, paraphrasing Genesis 1:11: “Let the Earth bring forth vines, yielding fruit after its kind, whose seed is in itself, upon the earth, and the Word was God”. Estelle screams.

In her room, for Jacques's sake, Estelle reveals to Catherine that her brother Alain, Philippe's father, did not die, but ran away, to escape. He now lives in the tower above. Upstairs, she recognizes Alain, who warned her. He explains: Les Treize Jours/Jouyeurs, the 13 days/dancers, are the 12 apostles dancing around Christ, or in the case of the heretic town of Bellenac, a living god suitable for blood sacrifice. Père Dominic, a pagan, celebrates a Black Mass. When Philippe kissed Jacques, it showed that Philippe was doomed.

Elsewhere, Jacques watches the priest praying over his father. The priest brings Catherine to Philippe. Detached, he tells her it can't be stopped. No one will believe her—No one ever has. He is dying for what he believes, for his people and his faith. He rides away with 12 robed figures and Christian. Catherine escapes, but is too late. Philippe's body is brought home through the vineyards. Jacques watches.

Cut to torrential rain, Jean Claude reading a newspaper account of the “accident”. As he drives the family away, Jacques insists he left his watch behind. Inside, the priest is waiting for him. Jacques kisses the amulet and runs back to the car.