XV century, Florence. The aristocratic Pazzi family is preparing one of the greatest conspiracies in history. The rebels are secretly supported by the Pope, believing that only with the fall of the Medici dynasty will the Catholic Church be able to establish itself in power. XXI century. A young graduate student comes to Florence to collect materials about the Renaissance artist, the author of the mysterious painting “Madonna of Nievole,” and finds herself in a web where love and jealousy, bloody Middle Ages conspiracies and the secrets of Masonic lodges are intertwined. A detective story that began five centuries ago finds a completely unexpected climax in our day.