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?

The story of a lively and curious kitten who is bored in his life as a domestic cat in Paris. His fate changes when ten-year-old Clémence takes him to her country house at the heart of the Vosges. Thus begins an extraordinary adventure through the wilderness for Clémence and Rroû...