Philippe Sands investigates the mysterious disappearance of senior Nazi, Otto Wachter, who was indicted for mass murder. The Ratline is a story of a curious death, political intrigue, spies, Nazi hunters, shadowy forces in the Vatican and a son grappling with the sins of his father. In episode one of this ten part series we travel to a castle outside Vienna to meet an old man who believes his Nazi father was murdered, and a voice from the past offers up clues to how it might have happened. Producer: Gemma Newby Sound Design: Neil Churchill