Montreal, October 1970. Manon's 12-year-old family is about to burst: she and her younger brother Mimi will be placed in foster care. Manon is revolted. Inspired by the political news, she develops a plan and hijacks an old woman to claim the right to choose her future. Assisted by her cousins ​​Martin and Denis, she leaves the city with Mimi and the old lady, determined to find a refuge where they would finally be free and happy. A film at once sensitive, funny and hard, The Mongol kings, it is the lucid look of children on the adult world, its lies and betrayals.