After Inspector Lu Yan dies, Shen Zhao’s fingerprints are found on a pocket watch, and she is named the prime suspect. A quiet records clerk is forced to return to the darkness and uncover the series of disappearances her superior concealed before his death. Between the investigation led by Assistant Police Officer Fang Rui, the evidence gathered by forensic examiner Wen Zhiwei, and the secret letters left by retired veteran detective Chen Huai, Shen Zhao discovers that Lu Yan was no victim, but the most dangerous traitor in the entire System. And she herself had once been his most trusted accomplice.
