Armando Lopategui, alias "Carapocha", a psychologist who is an expert in multiple murderers, appears in Valladolid to help Inspector Sancho in his investigations. Augusto has already found the woman he was looking for: only he knows what he wants from her. For his part, Sancho has to deal with two problems: a mishap that his mother suffers and the difficult relationship with Martina, the psycho linguist.
