After careful investigation, Wu Wei and Wang Delun discovered that the two penetrating wounds on corpse No. 11 were from a shotgun and a pistol respectively, which coincided with Cao Zhongshu's previous analysis.Later, Cao Zhongshu led a team of experts, Han Jingdong and others to the scene. They reconstructed the incident: the unnamed corpse No. 11 was first shot in the right cheek by a pistol, and a security officer who survived witnessed his colleague Zhang Yiwen (No. 8)Corpse) was shot in the chest by the robber's shotgun.Cao Zhongshu speculated that Zhang Yiwen tried to fight back with a pistol during his death struggle, but unfortunately he was shot by the robber again.

Regarding the question of whether Zhang Yiwen might have shot his companion, Wei Ning held a negative attitude.However, Cao Zhongshu confirmed that Zhang Yiwen had indeed shot the unknown corpse No. 11 through on-site simulation of bullet marks.Subsequently, the accomplice fired two more shots with a shotgun, one of which was deliberately hit at the muzzle of the pistol with the intention of destroying evidence.This discovery supports Qin Chuan's inference that the unknown corpse No. 11 is actually one of the suspects.Qin Chuan noticed that the suspect had obvious eye features and had dentures. This was probably an injury intentionally caused by his accomplice to conceal his identity.

In order to track down the suspect, Dai Changjiang sent Hu Bing to investigate dental clinics across the city, paying special attention to people with distinctive eyes.At the same time, Qin Chuan was ordered to review relevant files, and Xie Daoxin proposed to mobilize the masses to find the identity of the unknown corpse.Han Jingdong coincided with him and decided to publicly offer a reward of 50,000 yuan in newspapers and media for clues.

In the Qinchuan District archives, Qinchuan discovered clues to the robbery of Jinlu Savings Bank in 1991.In this case, two robbers used high-quality pistols, and one of them had obvious eye features.Qin Chuan believed that there might be a connection between the three cases and suggested a medical case investigation.Despite Hu Bing's objections, Han Jingdong adopted Qin Chuan's analysis, decided to merge the cases for investigation, and issued a reward notice.

At the market, Qin Chuan and Ye Maosheng were busy with investigation work, while Li Wen delivered a box of dumplings.At the same time, Li Baoan and Zhao Yongcheng made no progress in their investigation work at the dental clinic.At this time, He Yutao reported an important clue to Qinchuan: a driver surnamed Luo was robbed by three men and one woman near the Xishan Mine.Qin Chuan immediately went to the No. 9 Police Station to learn about the situation and decided to conduct an investigation in the community.

On the other hand, Cao Zhongshu proposed to clean and dress the unknown corpse No. 11 to restore its true identity.After washing away the blood, they discovered a snake-headed dragon tattoo on the deceased's left arm.This discovery provides new clues for the detection of the case.Prisoners in the detention center identified the unnamed body as Chen Xiaoqiu, and Hu Bing recalled that Du Fengchun had doubts about Chen Xiaoqiu.After a series of investigations, the task force finally determined the identity of Chen Xiaoqiu and listed more than a dozen people with whom he had frequent contact as suspects.