 It is April 1964 in Nazi Germany, in the week leading up to Adolf Hitler's 75th birthday.Detective Xavier March is an investigator working for the Kriminalpolizei ("Kripo"), as he investigates the suspicious death of a high-ranking Nazi, Josef Bühler, in the Havel on the outskirts of Berlin.As March uncovers more details, he realises that he is caught up in a political scandal involving senior Nazi Party officials, who are apparently being systematically murdered under staged circumstances.