For thirty years, Bruno's boss, known as J-J, has been obsessed with his first case. It was never solved and Bruno knows that this failure continues to haunt J-J. A young male body was found in the woods near St Denis and never identified. For all these years, J-J has kept the skull as a reminder. He calls him 'Oscar'. After visiting the famous pre-history museum in nearby Les Eyzies, Bruno might have an idea how to identity him at last ... Featuring Bruno, France's favourite policeman.