The thrilling aspect of this time-traveling drama guaranteed to excite any art-lover is the discovery of a painting by Leonardo da Vinci; far less moving is the obligatory romance driving the plot. Matt O'Brien, an art restorer at the Metropolitan Museum of Art, is cleaning a grimy little painting, buried under many coats of old varnish, when he realizes it may be a hitherto unrecognized Leonardo, potentially of inestimable value. The subject is a beautiful woman, whom Matt names Anna. He spirit...