A serial killer is on the loose in Münsterland, and his latest victim is found at Telgte's famous medieval market. But while Chief Inspector Sven Haller of the Münster Criminal Investigation Department and criminal psychologist Anna van der Pütten are groping in the dark, an investigator is hot on the heels of the mad killer, who seems to be insane himself: he calls himself Branagorn the Elven Warrior and claims to come from another world. But he seems to be the only one who can take on the killer ...