One crime. Two perspectives. One wants to unmask the criminals, the other hopes to see them punished. Vanessa, the policewoman, is an individualist who doesn't hesitate to break the rules to catch murderers. Justine, the magistrate, is a formalist who strives to ensure that the guilty are tried and punished. They have only one bond: their father. As half-sisters, they are forced to cohabit and collaborate in their work.