On an early morning in May, the police find the heavily beaten body of Maja Nielsen in a public park in central Aarhus in Denmark. She has fallen from a great height and her right arm has been cut repeatedly. Everything points to a suicide, and as the police dig deeper into the world of Maja, they discover a young woman plagued by paranoia and violent nightmares. Something was tormenting her. The investigation leads Daniel Trokic and his team to a distinct blood profile with traces of an unknown drug, a tattooed Colombian, and a particularly uncompromising animal rights activist who has been run over in a hit-and-run accident.