Madrid, summer 2010. Commissioner María Ruiz (Nieto) is confronted with a sinister crime: a young man has been murdered. No visible identity. No apparent clues. No cell phone. A conscientious woman, Maria will start an investigation that will become more and more complicated. But she is not alone: veteran journalist Luna (Coronado), a master of the profession today beset by the crisis and the digital era, and Tomás (Carril), a brilliant police computer scientist, will be key to getting to the end of the case.