Who is the woman behind the dazzling myth? Paulo Coelho steps into her shoes and allows her to narrate her extraordinary life in a fictional, final letter from prison: from the girl Margarethe Zelle from the Dutch province to the exotic dancer Mata Hari, who lived and loved according to her own ideals, thus becoming one of the first feminists. However, when World War I breaks out, she engages—both erotically and politically—in a dangerous double game.