On the eve of his wedding, a young doctor leaves Moscow to see his mother who lives in a nature reserve. Things are complicated by the fact that the doctor's ex-girlfriend is also there, and she is expecting a child.

新年前夕，住在莫斯科的外科医生热尼亚和他的朋友们按照传统，除夕之夜去公共浴池洗澡，为的是洗去晦气，干净地迎新年。朋友们一时兴起喝得酩酊大醉，最后把不该去列宁格勒的热尼亚，送上了飞往列宁格勒的飞机。走出机场，出租车司机把热尼亚送到同一街名同一门牌的大楼前，热尼亚用钥匙打开同一号住宅的房门，里面又是同样的家具。热尼亚在那里戏剧性地结识了美丽的娜佳，并爱上了她。