Heartbroken and alone, Boston art curator Sarah West is grieving the recent deaths of her parents and the end of her marriage. Ultrasensible by nature, she's determined to stay the course to get her life back on track. But fate has something else in mind. While cleaning out her father's closet, she finds a letter from the famous Parisian courtesan Marthe de Florian, dated 1895. The subject? Sarah's great-great-aunt Louisa's death. Legend has it Louisa...