A young agent leaves everything behind to pose as a member of ETA, risking her life to uncover the terrorists' hideouts in the south of France.

Madrid, Spain, 1936. The young Miguel Gila lives happily with his grandparents in a humble attic; but the outbreak of the Civil War forces him to go to fight.

The story of "Romance of the Black Moon" introduces Clara, a 75-year-old woman who lives alone in an apartment at the top of a Basque farmhouse. Her routine is disrupted by the arrival of a mysterious neighbor. From then on, the apparitions begin: shifting faces, philosophical presences, returning memories. Clara moves between the everyday and the extraordinary, between the tangible and that which fades like a dream. In each place, the encounters with these figures draw her closer to an intimate enigma.