The apple orchard behind Lujiamiao Village on the outskirts of Shazhou City was expropriated for development. When digging the foundation, a white skeleton was discovered. It turned out to be Zhao Yongmei, a rural female teacher who disappeared in Lujiamiao twenty years ago. Who killed her and buried her here? The Criminal Police Team of the Shazhou City Public Security Bureau opened an investigation. Zhao Yongmei's nephew Zhao Tianbai and team leader Hu Hanhai actively carried out the investigation, trying to clear the mists of time and find out the culprit.
At that time, in addition to Zhao Yongmei, there were two male teachers who taught at Lujiamiao Primary School. One was Lun Wenming, who was suspected of raping a young girl, but was exempted from criminal prosecution. He was transferred to a middle school in the city as the logistics director and continues to be at large. The other male teacher was Shen Dezhao, who changed his name to politics after leaving the education system. Just when Zhao Tianbai's investigation was getting closer, Captain Hu informed him that the bureau leaders asked Zhao Tianbai to recuse himself. The case was handed over to the Second Criminal Police Team, and the investigation work was delayed indefinitely.
Zhao Tianbai was unwilling to avenge his family and continued the investigation privately. Many pieces of evidence he obtained pointed to Shen Dezhao, who had changed his name to Shen Mengfei and was now the deputy mayor in charge of urban construction and transportation in Shazhou City. Could he be the murderer of Zhao Yongmei? How could Zhao Tianbai use his own efforts to compete with the powerful city leaders?