The recent revelations by Mediapart about the secret plot by Nicolas Sarkozy's followers to clear the name of a Libyan spy chief owe a great deal to one man: Samir Shegwara. It was this city councillor from Libya who sifted through the regime's old archives after the fall of Colonel Muammar Gaddafi in the 2011 revolution. There he unearthed key documents about the bombing of the UTA DC 10 carried out by Libyans in 1989, and about the subsequent efforts by Sarkozy's team to help the man convicted over the terror attack - Gaddafi's brother-in-law and security chief Abdullah Senussi. Mediapart went to meet him. Fabrice Arfi and Karl Laske report.