In 2021, Edurne Portela receives a call in which she is offered some historical documents about María Josefa Sansberro, known as Maddi. Maddi, born in Oiartzun in 1895, ran a popular hotel back in the 1930s, at the foot of Mount Larrún, on the border between Spain and France. At first glance, Maddi already seems a disquieting woman, full of contradictions, who has crossed physical and moral limits: a smuggler and a mugalari (Basque word for a person who helped politically persecuted people cross the border between Spain and France); a fervent Catholic yet a divorcée; a childless woman yet a mother, both a Nazi collaborator and an agent of the Resistance. Portela accepts the challenge and follows Maddi's life until her last moments. The result is a gripping novel about a woman who did not conform to the conventions of her time, and who always defied expectations.