Ahmad, Tahar Rahim, an Iranian man, returns to France after four years to finalize his divorce from Marie, Bérénice Bejo. On the way to her home, he learns that she has begun a relationship with Samir, Ali Mosaffa, the owner of a dry cleaning service, who will share a room with his son Fouad, Elyes Aguis. At Marie's request, he speaks with her daughter Lucie, Pauline Burlet, regarding her recent troubled behavior. Lucie disapproves of Marie's new relationship.
Ahmad and Marie attend court to complete their divorce. Just before the meeting with the officials, she tells him that she is pregnant with Samir's child. Ahmad continues to counsel Lucie, hoping to reconcile her to the situation. She reveals that Samir is still married and his wife is in a coma after a suicide attempt, caused by the revelation that Samir and Marie were having an affair. Samir tells Ahmad that his wife suffered from depression and the suicide attempt was in fact caused by an incident with a customer in his shop. His wife was unaware of his affair and he arranges for Naïma, his employee, who witnessed both the suicide attempt and the incident in the shop, to meet with Lucie.
After hearing Naïma's story, Lucie becomes distressed and confesses that she forwarded Marie and Samir's email correspondence to Samir's wife the day before she tried to kill herself, after calling her at the dry cleaning shop. Lucie disappears, and Ahmad and Samir search for her. Ahmad finds Lucie, who has been staying with a friend, and tries to convince her to tell Marie what she did, saying that Marie has a right to know, now that she is carrying Samir's child. Lucie does so and Marie becomes enraged, telling Lucie to leave, which she does. Ahmad calms the situation and Marie goes after Lucie, asking her to come back, which she does.
After questioning what feelings he may still hold for his wife, Marie tells Samir what Lucie did. Samir finds this hard to accept and questions Naïma about the events leading up to his wife's suicide attempt. Naïma states his wife wasn't even in the shop the day that Lucie said she called. After Marie accuses Lucie of lying, Lucie maintains her version of events saying that she spoke to a woman with an accent on the phone. Samir realizes that she actually spoke to Naïma, who then gave Lucie his wife's email address. He confronts Naïma, who confesses and explains that his wife had always been jealous of her and had been trying to get her either sacked or deported from France and had initiated the confrontation with the customer. However, Naïma believes that his wife never read the emails, because she came into the shop and chose to drink bleach in front of her, instead of in front of Samir or Marie.
Samir and Marie discuss the events and their relationship. Samir decides that they should focus on their future, while Marie appears conflicted. Ahmad prepares to return to Iran. He says farewell to the children and attempts to talk to Marie about the end of their marriage, but Marie does not let him, stating that she doesn't need to know such things now. Meanwhile, Samir visits his wife in the hospital with a selection of perfumes, which the doctors have recommended in order to possibly initiate a response. He sprays onto his neck some of his cologne and leans over her lying comatose in her hospital bed. With his face close to his wife's he whispers to her to squeeze his hand if she can smell it. A tear rolls down her cheek but she remains comatose, and he looks down at her hand, which may or may not be holding his. It is unclear in the final scene whether she is responsive or not.
