Charles is a meek inventor living with his greedy nagging wife Rose. The mail brings them a misdirected box saying "Do Not Open This Box". Then the postman comes looking for it and says there will be Hell to pay if he doesn't get it back.

古老的北京城，中年男子孙子旺（梁冠华 饰）和妻子杨喜莲（杨瑞霞 饰）过着平凡的生活。一封当年插队恋人秀儿的来信，将孙子旺夫妇本就危机重重的婚姻彻底摧毁。原来信中秀儿提及曾生养一对龙凤双胞胎，因无力抚养和社会的压力而将孩子送人。肩负秀儿的嘱托，孙踏上了寻找孩子的旅途，几经辗转却得知孩子们早就被人领养送到了美国。孙在美国找到…