As the Nazis invade Paris, archivist Anne Guichard is sent to the Castle of Chambord, where the Louvre's most precious artworks—including the Mona Lisa—are being transferred to ensure their safety. As danger comes ever closer, Anne learns the truth about her missing brother and the role he plays in the war. Laura Morelli's captivating historical adventure also unfolds in 15th-century Florence, as Lisa Gherardini's portrait is being painted by Leonardo da Vinci. Lisa's servant Bellina will be entrusted with a secret, and she will be tempted to join an uprising against the Medici.