Three women entered the police station to access the museum by depositing their identity cards. A fourth entered and passed without giving his card. The next day, the head of the museum, arriving at the museum, discovers the lifeless body of one of them, in the room of the technical and scientific police, next to the seats, a 1900 browning gun placed on one of the seats. On the floor are glasses and a broken heel. Who is this young woman? What could have happened to her? A murder? But then who and why? A suicide? This survey offered to children is based on learning the techniques of identification of victims and criminals by transmitting the history and evolution of the technical and scientific police.