The appearance of a new corpse causes unrest in the city. There is no longer a doubt: a monster is loose in Valladolid. A murderer who has had a sexual encounter with Violeta, a young woman who is unaware of the danger she is in. Meanwhile, a clue given to them by the psycholinguist Martina causes Sancho and Carapocha to step on Augusto's heels for the first time...