zio Rosenman is a Polish Jewish child who survived the Buchenwald concentration camp and has lived in the neighbourhood since 1953. Following his meeting with Kamel Chabane, a local boy who became a historian to understand the tragic disappearance of his father, who was called up for the Algerian War, Izio Rosenman decided to take part in the Year 9 project at Collège Flaubert. He thus spoke for the first time in his life in front of pupils. They will all travel together to Buchenwald, where Izio Rosenman will recount his experiences as a child in the ghetto and the camp, as filmed by pupils of roughly his own age during the Second World War. Through this journey of discovery, Izio and Kamel pass on to a new generation of pupils from migrant backgrounds the personal motivations behind their commitment to fighting all forms of intolerance. A labour of remembrance to build a society. A vaccine against the poison of hatred. A hymn to life and to the future.