About the book: 2007 / The dagger, which, according to legend, was made for Duke Lorenzo de Medici by Leonardo da Vinci himself... Most art historians believe that this mysterious blade does not exist... But the curator of the Washington National Gallery of Art accidentally became the owner of the first page of Leonardo’s manuscript, which encrypts the story of the appearance of the dagger, and was soon killed. Many years later, his son and a girl art historian specializing in the work of Leonardo da Vinci begin the hunt for the mysterious artifact. there are people who are ready to do anything to ensure that the secret of the dagger is never revealed!