在早年就跟随母亲南下生活的女孩林淼回到了童年故土——百里洲，她希望通过徒步旅行的方式，用镜头记录下长江上这一四面环水的美丽孤洲。然而旅途尚未开始，就因林淼错失赶往县城的最后一班渡船，草草中止。面对黑夜的逼近，无处留宿的林淼不得不提前回到居住在沙洲上的外祖父母家。而外孙女林淼的意外到来，划破了他们看似祥和平静的的生活，两位老人一时喜不自禁。然而，阔别相逢的喜悦很快就被冲散……

childhood place - Bailizhou. She hopes to record with her camera the beautiful isolated land surrounded by water along the Yangtze River during her hike. However, the hope is abruptly put to an end before the hike starts because she misses the last ferry to the county. As the night draws, Lin Miao has no choice but to return to her grandparents' house on the sandbank earlier than expected. Her surprised return rippled their seemingly peaceful life and the old couple are very happy. However, the joy of reunion is very soon dispelled...