10-year-old Sebastien reluctantly spends his vacation in the mountains with his grandmother and aunt. Helping them with the sheep is hardly an exciting prospect for a city boy like him - but that is without considering his encounter with Belle, a huge dog mistreated by her owner. Ready to do anything to fight injustice and to protect his new-found friend, Sebastien will spend the craziest summer of his life.

Belle and Sebastian is an adventure drama film set in the Alps during World War II. It follows the story of Sebastian, a young boy, and his loyal dog, Belle, as they navigate through the challenges of war and form an unbreakable bond. Together, they embark on a journey of friendship, bravery, and survival, facing obstacles and dangers along the way.

In this final installment of the Belle and Sebastian trilogy, Sebastian and his dog Belle embark on a new adventure in the Alps mountains. When Sebastian's friend Angelina is kidnapped, they must journey through dangerous caves and face off against contraband smugglers to rescue her. Along the way, they form a strong bond and fight against all odds to bring her back home.

In post-World War II France, a young boy named Sebastian and his loyal dog embark on a journey to save his missing mentor. Together, they must navigate the treacherous mountains, encounter unexpected dangers, and uncover a family secret. With the help of a strong female character, they learn the importance of courage, friendship, and overcoming adversity.