Things are looking grim for Mick and Andreas: a colleague from the criminal investigation department is brutally murdered—and Mick and the entire department are suspected of being involved. The Internal Affairs Division, which assigns two tough officers, Caroline Hillebrecht and Falk Schröter, to the case, has evidence that Jonas was corrupt. And because he was about to spill the beans, the officers assume that someone wanted to silence him—someone from the department!