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In the name of "field research", two psychology graduate students returned to Huaishugou, a closed village where the household registration had been cancelled. After a bizarre car accident, Jiang Lin, a taciturn and highly intelligent researcher, disappeared in a ward where it was impossible to escape. The detective Xie Xun, who took over the case, gradually discovered during the investigation that everyone in this village died before their household registration was cancelled, and there was a truth hidden between Jiang Lin and Huaishugou that even he himself did not know.