A brutal murder, a police investigation, a family secret # An exciting thriller narrated three times whose mystery delves into the darkest recesses of the human soul. 1921. The body of Irene Sanz Martin appears bled to death in her living room with separate members of the body. This is a real carnage. Antonio Rodriguez, captain of the Civil Guard, had never seen anything like it, but it should take over the investigation by the commander Diego Rosales, sent from Burgos. Present. Born into a wealthy family, Rodrigo has hardly needed work. He promised Carmen, is on holiday in Switzerland when it receives a call from his sister, his father, Ernesto, is very serious. When they reach Soria it is too late: the man has died in a car accident, leaving behind a strange behavior and increasingly taciturn whose cause Rodrigo will be unveiled through the clues left by his father. The story of both events are masterfully combined with the epistolary novel series framing. The police investigation, the story of Rodrigo and his father and letters of unknown sender form a complex and somber loom enclosing an even darker myster