When the body of a man is found brutally murdered in a wildlife park and tattooed with a letter A, criminal profilers Jan Grall and Rabea Wyler are thrown into a deadly game of cat and mouse.
Later, two more mutilated bodies are found, again with tattoos on their skin – B and C – and it becomes clear that Grall and Wyler are dealing with a brutal serial killer. One who won’t stop until his set is complete.
When Grall’s hotel room is marked with a Z and his girlfriend kidnapped, the race is on to find out who the killer is.
