Klim Roshchin is a policeman who, before the police, started out as an ethologist, studied the life of wolves, lived in a pack. He uses his bestial instinct to catch criminals.
一对同母异父的小姐妹，妹妹八岁，与父母同住，幸福富有，姐姐十三岁，跟着外婆，贫困艰难。起先，妹妹歧视姐姐，但当妹妹的父亲卷入了一场黑帮争斗中而被人追杀时，唯一来帮助妹妹的，却是她以德报怨的姐姐。姐姐带着妹妹逃跑，两人相依为命，闯过了一个又一个险境。姐妹俩人的关系最终由嫉恨化解成了爱。
