The Cologne police know a woman is going to die. They know the day it will happen. And they're powerless to stop it. They call on an outside expert: Jan Fabel, head of Hamburg's Murder Squad and Germany's leading authority on serial killers. Fabel is on the point of leaving the police for good, but Carnival in Cologne is a time when the world goes crazy, and he is drawn into the hunt for the Carnival Cannibal. Fabel finds himself on a trail of betrayal and vengeance, violence and death chasing down the true Master of the Carnival.