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A serial murder case occurred in Linjiang City, the provincial capital. A man who called himself "The Judge" claimed to have killed seven people in a row in seven hours. The police launched an investigation and tried their best to stop the Judge's behavior and arrest him. The two sides launched a life-and-death duel of wits and courage within 24 hours, and the case worsened step by step. The police headed by Lu Yan discovered that more and more people were involved in the case. It turned out that the perpetrators were far more than just the judge. When the case became more and more confusing, the lives of Lu Yan and other police officers were hanging by a thread several times. As he gradually uncovered the mystery and found the real murderer, he unexpectedly found a heart-wrenching truth hidden behind the real murderer's crime...