Five hundred years can confuse identity. An old chalk drawing of a girl, Maria, the daughter of a Chianti vintner leaves a Swiss art collector, Claude Beauvin entangled in a Renaissance love story from the past. The drawing is currently owned by a reclusive young widow, Andrea Garibaldi-Chase, who puts the drawing up for auction. With smoldering rumors that Leonardo da Vinci is the artist of the portrait, history is set on fire by a New York art dealer, an art history professor, and an...