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Sarah (Élodie Bouchez) a young Carmelite nun, collapses in pain, dazed and spouting a nonsense phrase. Concurrently, a great distance away, her identical twin sister, Gaëlle (also Bouchez), in prison, wakes up to find her cell in flames. While Gaëlle, the victim of an attack by her fellow prisoners, is transferred to a different prison, Joachim (Gérard Depardieu), a Cecilian (both a doctor and a priest) visits with Sarah. He's perplexed by her case because her tests all came back normal, and he deducts that her spells must have a psychological source. But Sarah isn't forthcoming about her past, and Mother Emmanuelle (Carmen Maura), who runs the convent, doesn't even want Joachim to treat the young woman. Through his investigations, Joachim learns that Sarah has a twin sister, to whom she may have some kind of psychic connection. Delving deeper into the past, he discovers that Gaëlle went to prison for a horrible crime at around the same time Sarah entered the convent. Joachim is dealing with the violence of his own past, and cannot let go of his prying, despite the advice of his colleagues. He finds Gaëlle after she is released on parole, and takes her in. Their relationship becomes more complicated, and they are threatened by others who would prefer that the past stay buried. The Pact of Silence was based on a novel by Marcelle Bernstein. It was adapted for the screen by Roselyne Bosch (1492: Conquest of Paradise) and directed by Graham Guit. The film had a theatrical release in France, but was released straight-to-video in the U.S.