12 year-old Sebastian has decided not to follow his father and Angelina to Canada, deciding to stay in the alps to watch over Belle who has now become the mother of three beautiful pups. When a stranger arrives claiming to be Belle’s rightful owner, Sebastian will do all it takes to protect his best friend and her little ones.

September, 1945. Sebastian impatiently waits for the return of his friend Angelina, whom he has not seen for two years. When the plane carrying the young woman to her small village in the Alps is reported to have crashed in the mountains, Sebastian is convinced that Angelina is still alive. Along with his faithful dog Belle, Sebastian embarks on the most dangerous adventure of his life.

Belle and Sebastian is set high in the snowy Alps during the Second World War. The resourceful Sebastian is a lonely boy who tames and befriends a giant, wild mountain dog, Belle – even though the villagers believe her to be ‘the beast’ that has been killing their sheep.