Parisian cop Simon Coleman, specializing in undercover work, gains custody of his orphaned niece and nephews after his sister and brother-in-law tragically die. He must balance his dangerous job with raising the children.

After an accident, a kidnapped teenager reappears miraculously. The other girl that vanished with her, five years ago, is still missing.

Alice Nevers is a young and beautiful investigating judge. With her partner, policeman Fred Marchand, they use their own power to solve crimes to each their method.