At night in the Jiangnan water town, a faint soul lamp will always light up on the river bank, attracting passers-by to approach, but then disappear from the world. Zuo Xiuming, a knowledgeable man in the village, does not believe in ghosts and gods, but he has to conduct an in-depth investigation because of his father's mysterious disappearance. However, the truth under the soul lamp not only concerns the rest of the wronged soul, but also involves the secrets buried deep in the family. When he lifted the last layer of the curtain, what awaited him was a fateful showdown.