Travel back to an extraordinary period of revolutionary change: turn-of-the-century Paris. Walk its backstreets. Meet the infamous thieves—and detectives—of the era. And then slip back further in time and follow Leonardo da Vinci, painter of the Mona Lisa, through his dazzling, wondrously weird life. Discover the secret at the heart of the Mona Lisa—the most famous painting in the world should never have existed at all.