The film begins with Hubert Minel giving a black-and-white
monologue explaining how he loves his mother but cannot stand being her son; he also reveals that when he was younger, things were better between them. Hubert is a 16-year-old
Québécois living in suburban
Montreal with his single mother, Chantale, who divorced Hubert's father, Richard, when Hubert was much younger. Hubert barely sees his father, and this adds to the animosity between mother and son. One morning, as his mother drives him to school, Hubert starts an argument with her about her applying makeup while driving. The argument ends when Chantale stops the car and tells him to walk to school. At school Hubert claims to his teacher, Ms Cloutier, that his mother is dead. After the teacher finds out that it is a lie, she expresses this lie as "you killed your mother." This inspires Hubert to write an essay for school titled "I killed my mother." Later in the film, Hubert expresses to his mother that he wants to live in his own apartment. At first, his mother seems to agree, but the next day she has changed her mind and does not allow it, claiming that she thinks he is too young. Hubert's friend Antonin is revealed to be his boyfriend, but Hubert has not told his mother, and she finds out from Antonin's mother, who assumed that Chantale already knew. Chantale, to some extent, accepts her son's
homosexuality; however, she appears hurt that he did not tell her. The relationship between mother and son continues to deteriorate, and Hubert goes to live with his teacher, pretending to be staying with his boyfriend. Hubert's father invites him over for a visit; however, once there, Richard and Chantale tell Hubert they've decided to send him to a boarding school in
Coaticook. Hubert is deeply angered that his father makes the decision, since Hubert only sees his father at Christmas and Easter. At the Catholic boarding school, Hubert meets Eric, with whom he cheats on Antonin. Eric invites Hubert to go to a nightclub with the other students, where they kiss and Hubert takes
speed. He takes the Metro home, wakes his mother, and has an emotional conversation with her. The next morning, she takes Hubert to Antonin's mother's workplace to help drip the walls in paint. He and Antonin finish, and he lays down. Antonin proceeds to lay on top of him and kiss him, and they end up having sex. Hubert, later at home, finds out that his mother has enrolled him for another year at the boarding school. Because of this, Hubert trashes his mother's bedroom, but soon after, he calms down and cleans it up. The two fight, and Chantale sends Hubert to Antonin's house, from which he returns to school the next day. Back at school, Hubert is beaten by two fellow students. This causes Hubert to run away from school. The school's principal calls Chantale to inform her of the developments, revealing the note Hubert left, saying he will be "In his kingdom". Chantale knows exactly where Hubert's "kingdom" is; the house he lived in as a child with both his parents. The principal also begins to lecture Chantale, which causes her to have an angry outburst at him, saying how he thinks he's better than her and how he has no right to judge a single mother. Hubert runs away with the help of Antonin, who has borrowed his mother's car. On the journey, Antonin tells Hubert that he is selfish and only cares about himself, but adds that he loves him. Indeed, she finds Hubert and Antonin there. Chantale sits next to Hubert overlooking the beach. The film ends with a home video clip of Hubert as a child playing with his mother. ==Cast==