On August 21, 1911, the unfathomable happened--Leonardo da Vinci's Mona Lisa vanished from the Louvre. More than twenty-four hours passed before museum officials realized she was gone. The prime suspects were as shocking as the crime: Pablo Picasso and Guillaume Apollinaire, young provocateurs of a new art. As French detectives using the latest methods of criminology, including fingerprinting, tried to trace the thieves, a burgeoning international media hyped news of the heist.