During the autumnal equinox, Chen Yan returned to Qingxi Village after five years of absence for the funeral of his grandfather Chen Shouyi. While packing up his grandfather's belongings, he found a rosewood box containing an ebony tablet engraved with strange patterns and words. Since then, strange things have happened one after another: a crying shadow in white appears outside the window at night, the wooden sign makes a "dong-dong" sound, and the wooden cabinet door opens on its own... Through the grandfather's diary and the village party secretary Wang Jianguo's narration, Chen Yan learned that his grandfather's death and Li Xiulian's drowning ten years ago were all related to the ebony sign and the legend of Qingxi's "water ghost". He is determined to find out the truth, even if the road ahead is dangerous.
