On 9 October 1967, Sergeant Teran walked into the room where Che Guevara was being held prisoner and shot him. Writers of history were quick to point to one of Che's own men as his betrayer. For 30 years, the man has been living in silence in Malmö, Sweden. Documentary filmmakers Erik Gandini and Tarik Saleh spent a year working on a film about the events surrounding the death of Guevara - one of the best-known icons of the modern era. Gandini and Saleh were guests in the home of the man who shot Guevara, a former CIA agent who goes around with Guevara's last tobacco in the butt of his pistol. History fingers Ciro Bustos as the man who betrayed Guevara. But was he really a snitch? French philosopher Régis Debray, who was captured at the same time as Bustos, subsequently became something of a hero to the European Left. But what was his role in this? French historian and Guevara biographer Pierre Kalfon is one of the many who have written books on this. How reliable is he? This programme, whose point of departure is a detail in our modern history, takes us on a journey across three continents. With rapid cuts and in ambitious form, it mates traditional, investigative journalism with a powerful visual idiom. The film immediately caused a world-wide debate.