The Ghent Altarpiece is the most violated work of art in the world. Thirteen times it has been vandalized, dismantled, or stolen. Why? What secrets does it hold? Enter UNESCO investigator, Nicholas Lee, who works for the United Nations' Cultural Liaisonand Investigative Office (CLIO). Nick's job is to protect the world's cultural artifacts-including countless lesser-known objects and national treasures. When Nick travels to Belgium for a visit with...