Synopsis: Sébastien, 10 years old, reluctantly spends his holidays in the mountains with his grandmother and aunt. He has to give a hand to the sheepfold, nothing very exciting for a city boy like him... but that's without counting on his meeting with Belle, a huge dog who is mistreated by her master. Ready to do anything to avoid injustice and protect his new friend, Sébastien is going to live the craziest summer of his life.