Enola returns to her lodgings to find that somebody has kidnapped her landlady, Mrs. Tupper. After investigating the ransacked lodgings, she abduces that the kidnappers were after a secret message hidden in Mrs. Tupper's old crinoline dress. Enola traces the dress to Florence Nightingale, who met Mrs. Tupper in the Crimean War. After several visits to Nightingale, Enola discovers that Nightingale conducted espionage during the war. As such, Nightingale asked Mrs. Tupper to smuggle a note in her crinoline back to England but did not know that the war widow was deaf and did not understand her. Enola also realizes that Nightingale pretends to be an invalid to avoid attending social functions expected of a wealthy woman. She realizes that the functions would take time away from writing letters to achieve social reform for the needy. During her visits to Nightingale, Enola suspects someone is following her. As the person could be related to the case and a danger to Mrs. Tupper's and her safety, she relocates to the Professional Women's Club.