A bizarre murder occurred in Haidu City. The scene was bloody but a strange black velvet rose petal was left behind. The cold-hearted criminal police captain Lu Zhiyuan and the keen criminal psychology consultant Shen Xin are forced to partner up. During the investigation, a mysterious "scale" symbol appeared behind the petals. The wife of the second victim was kidnapped and then mysteriously released. She also received a death notice saying "You are next".
Ritual killings and twisted "trial" logic, all clues point to a highly intelligent criminal who calls himself "The Scale of Justice." Lu and Chen must delve into the murderer's psychological puzzle like playing chess in the collision of ideas and crisis. When the investigation touched on the shadow of an old case ten years ago, they discovered that this "trial" had already targeted more people, and that there were shocking secrets hidden at both ends of the scale that could subvert everyone's fate.
Time is running out and the next victim could appear at any moment. Can they solve the ultimate mystery behind the symbols before the murderer completes the final "balance"?
