From Mexico to Russia, from Germany to India, director Vladimir Léon goes in search of a revolutionary adventurer from Bengal: M. N. Roy. Founder of a communist party in Zapata's Mexico, leader of the Communist International in Soviet Russia alongside Lenin, anti-Stalinist and anti-Nazi activist in pre-war Germany, politician and atheist philosopher in post-independence India, Roy embodies the struggles of a century that he crossed on three continents. However, the official histories of these countries have preferred to erase the trace. By meeting with direct and indirect witnesses, Léon patiently reconstructs the chaotic existence of a free spirit.