Salamanca, Spain, 1936. In the early days of the military rebellion that began the Spanish Civil War (1936-1939), writer Miguel de Unamuno supports the uprising in the hope that the prevailing political chaos will end. But when the confrontation becomes bloody, Unamuno must question his initial position.

Samuel Salomon, a literature professor, has been off work for almost a year after the tragic death of his girlfriend. Samuel has been suffering from a recurring nightmare in which a woman is brutally murdered in a strange ritual. Suddenly, the same woman who appears every night in his dreams is found dead in exactly the same circumstances. Samuel sneaks into the crime scene and there he meets Rachel who has also dreamed about the murder. Together, they will do whatever they can to discover the identity of the mystery woman, entering a terrifying world controlled by the figures who have inspired artists throughout time: the Muses.