A novel adapted from a real case. In the late autumn of 1998, Longyou County in western Zhejiang Province. Hu Xuemei, a female dental clinic doctor, died mysteriously. Her husband Li Bingyan was distraught and claimed that his wife died suddenly of a heart attack. Shao Mingyi, an emergency doctor at the County Hospital of Traditional Chinese Medicine, discovered a strange pinhole on the deceased's left arm during the rescue operation, and the surrounding skin was dark brown and necrotic. With years of professional intuition, he determined that this was no ordinary sudden death and insisted on reporting the case. Lin Bin, a young policeman, took over the case and persisted in the investigation despite the doubts and pressure of "meddling in other people's business". Female forensic doctor Li Zhen found during the autopsy that the toxins in the deceased's body were highly consistent with the symptoms of snake venom poisoning. However, because there was no snake venom detection technology in China, the case was deadlocked. The battle between sin and justice. Li Bingyan thought that the "perfect murder" could escape legal sanctions by using technical blind spots. However, the legal network was restored, and every tiny flaw eventually became ironclad evidence against his crime.
