Turn-of-the-century Paris was the beating heart of a rapidly changing world. Painters, scientists, revolutionaries, poets - all were there. But so, too, were the shadows: Paris was a violent, criminal place, its sinister alleyways the haunts of Apache gangsters and its cafes the gathering places of murderous anarchists. In 1911, it fell victim to perhaps the greatest theft of all time - the taking of the Mona Lisa from the Louvre. Immediately, Alphonse Bertillon, a detective world-renowned for pioneering crime-scene investigation techniques, was called upon to solve the crime. And quickly the Paris police had a suspect: a young Spanish artist named Pablo Picasso...