In the half-light of a basement, Quai des Orfèvres, is a reconstructed crime scene. Aurore, in her protective suit, snaps away; she is training. Yves and Thierry, her instructors, have been with "the firm" for ages, they know the job inside-out. Photographing a crime scene requires technique, a particular angle for evidence, a certain approach to space. A little-known profession, but one essential to justice: forensic photographer.