Lucie Dervin is a happy mother. But one afternoon, while accompanying her daughter, Iris, to the park downstairs, she is kidnapped in front of her eyes. The police manage to arrest the thief who claims that Iris is their daughter, kidnapped at birth in the clinic where she gave birth... The Minors' Brigade is seized. Which family does Iris belong to? Dervin or Mosquera? Mattéi and his team find themselves managing the most delicate investigation in their history.
