The only clue to the identity of a serial killer is a strange collection of bible verses, in a race against time in quiet Castellón, as the town is turned upside-down by the macabre discovery of a brutally mutilated body in a town-centre flat. To solve the case, Commissioner Romales requests the help of Inspector Bartolomé Monfort, with whom he worked on the case of the murder in Streetlamp Square. Together, the men reconstruct the story of the victim, the manager of an employment office with a reputation as a womaniser. But the case becomes more complicated with the discovery of a second body that has no apparent connection with the first. Luckily, the intuitive and efficient Inspector Monfort wastes no time in uncovering the clues that open up the investigation.