A French family with two daughters, 10-year-old Laure and 6-year-old Jeanne, moves to a new neighborhood during the summer holidays. With her tomboy ways, Laure is immediately mistaken for a boy by the local kids and passes herself off as Mickaël.

We follow 24 hours in the life of a being moving from life to life like a cold and solitary assassin moving from hit to hit. In each of these interwoven lives, the being possesses an entirely distinct identity: sometimes a man, sometimes a woman, sometimes youthful, sometimes old. By turns murderer, beggar, company chairman, monstrous creature, worker, family man.