An engaging historical novel picked in Renaissance Italy in Naples in 1633. Aqua Tofana – Only one drop is needed to heal. Three drops are required to kill. Giulia Tofana longs for more responsibilities in her mother's herbalist business, but Mamma has always been cautious and unwilling to reveal the secrets to her mother's success. But when Mamma is arrested for poisoning the powerful Duke de Verdi, Giulia is shocked to learn about the darker side of her trade. Giulia flees for her life to Naples, under the shadow of Mount Vesuvius, to the home of her Aunt Isabetta, a famous courtesan. But when Giulia learns of her mother's execution and the cruel manner in which she died, she swears she will exact revenge on the Duke de Verdi. The problem is that Domenico, the Duke's brother, controls Naples and the 'Camorra,' the mafia. Worse, her Aunt Isabetta, who is in his thrall, insists on her being his consort. Based on Giulia Tofana's legendary life, this is a story about hidden family secrets and how courage and love can triumph over vengeance.