The novel tells the story of Mata Hari, a famous exotic dancer in Paris during World War I. She becomes known for her beauty and charm, which brings her into contact with powerful military and political figures. During a time of fear and suspicion, she is accused of spying for Germany. In 1917, she is arrested and later executed.
Through her final letters, she reflects on her life, love affairs, and the way society judged her. The story questions whether she was truly a spy or a woman unfairly condemned because of prejudice and political paranoia.