1941, Berlin. After Police Chief Investigator Rolf Schneider is summoned to a meeting with Himmler and tasked with investigating the assassination of Heydrich, he exposes a web of corruption and secrecy involving the highest-ranking figures in the Reich. Schneider is faced with an agonising dilemma, for the secret he discovers is both the only thing that can save his life and what will mark him down for certain death. His choice will propel him into a desperate race against the clock, one in which he literally has to travel to the very heart of darkness to realise his goal.