Common sense dictates that it simply cannot exist -- the "Leopardi Madonna," a glorious treasure by the fifteenth-century master Santi Raphael. All the reference books and reliable scholarship indicate that the painting was destroyed in 1945, when the Allies bombed a Nazi warehouse filled with looted art. Only now the Madonna has reappeared, it seems, in this stunning, original thriller that uncovers greed and treachery in the rarefied precincts of...