故事继续于1945年9月,第二次世界大战刚刚画上句点,全世界都在欢欣鼓舞地迎接着久违的和平时光。此时的塞巴斯蒂安(菲利克斯·博叙埃 Félix Bossuet 饰)已经成长为了一名10岁的少年,他和小狗贝勒以及祖父萨塞尔(切基·卡尤 Tchéky Karyo 饰)一起居住在位于圣马丁的山寨之中。 两年前,塞巴斯蒂安最好的朋友安吉丽娜(玛格·夏特莉 Margaux Châtelier 饰)在战争中失踪了,她所乘坐的飞机坠毁在了阿尔卑斯山上的茫茫雪原之中。虽然所有的人都认定了安吉丽娜凶多吉少必死无疑,但塞巴斯蒂安还是不愿意放弃心中的希望。他找到了聪慧而又勇敢的飞行员皮埃尔(蒂埃里·钮维 Thierry Neuvic 饰),在后者的帮助之下,塞巴斯蒂安带着爱犬踏上了寻找好友之旅。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 . . .