In the peaceful world of Little Nicholas, there is Daddy, Mommy, the school, but above all, his band of friends. They are called The Invincibles, but above all they are inseparable. At least they think so. But when Dad gets a promotion and announces that the family is moving to the south of France, Nicolas' world falls apart. How can he imagine life without his best friends?

In the city of Guelma, which was once called Heliopolis in ancient times, the daily life of an Algerian family takes its usual course. But on May 8, 1945, the day the end of World War II was announced, demonstrations by the Algerian people against the French colonial power and for the country's independence took place, which were bloodily suppressed by the French army and French settler militias. The event went down in history as the Sétif and Guelma massacre.