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?

Little Nicholas is a mischievous child who gets into all sorts of hilarious situations at home and at school. He lives in 1960s Paris and has to deal with strict teachers, social stereotypes, and family relationships. Despite the challenges, Little Nicholas always manages to find joy and adventure in his everyday life.

Nicholas, a 10-year-old boy, goes on a summer vacation with his family at a seaside hotel in the 1960s. He engages in mischievous activities and daydreams about various adventures. Along the way, he forms friendships, encounters a snake, participates in a costume ball, and deals with his parents' arguments. The film captures the essence of a nostalgic summer holiday and explores themes of friendship, family dynamics, and childhood innocence.