He vanished in 1974 in northern Cambodia while trying to interview the Khmer Rouge. Marc Filloux, a young AFP reporter, was only 29. Fifty years later, Jean-François Bouvet retraces his fate in an investigative book, "L'homme qui voulait rencontrer les Khmers rouges" ("The Man Who Wanted to Meet the Khmer Rouge"), published by Éditions L'Harmattan.