Zheng Wanjiang carefully inspected He Jingang's room, and found a deck of playing cards on the bed, he checked it, and there were two missing cards in it, which were the King of hearts and the ace of hearts. It seems that He Jingang has a major suspicion, it was he who entered He Jinqiang's room, took the passbook and found someone to withdraw the deposit, but why did he enter through the back window the second time, it was very convenient for him to enter He Jinqiang's room, there was no need to do this at all, what was the purpose of his doing this, could it be that he killed He Jinqiang? They're brothers, is that possible? Zheng Wanjiang thought so in his heart, and he extracted the shoe prints under the bed.

"Uncle, is the door of your house locked at night?" Zheng Wanjiang asked.

"It's not very safe now, after locking it, I plug in the latch every day, and I open it when the kids come back, is there anything wrong with that?" He Jiaqi replied.

Zheng Wanjiang nodded, he understood, the person who entered He Jinqiang's room must be He Jingang Undoubtedly, he knew the situation at home, he was afraid that he would not be able to enter the door at night, for the sake of insurance, he did his hands and feet on the back window in advance, and was ready to enter the room for the second time, he did not do this without three hundred taels of silver, and it has been proved that he has not entered He Jinqiang's room, but a woman entered He Jinqiang's room through the back window, judging from the current situation, this is not just a murder for money, there is a great conspiracy behind it, There is a criminal gang operating in secret. He Jinqiang's certain things triggered their interests, so they killed him, and only in this way could their actions be kept from being exposed.

He Jingang was included in the attention of the Public Security Bureau, but at present, he is only suspected, and there is no conclusive evidence to prove that he is a murder suspect, which depends on the results of Sun Yaozhang's investigation.

Zheng Wanjiang returned to the Public Security Bureau, copied Zhu Chunhong's photo, and immediately arranged for the woman who had withdrawn He Jinqiang's deposits, especially at the main intersections of the bus station and railway station, to prevent the suspects from fleeing. This is a very important clue, and it can be said that it is the key to solving this case. Zheng Wanjiang sent the two letters to He Jiaqi and He Jingang's shoe prints to the technical department for technical testing to see if there would be any traces.

Who wrote this letter? It is possible that the person who wrote the letter instigated or participated in the murder of He Jinqiang, all kinds of indications indicate that this was a gang crime, and it was by no means a single person who committed the crime, and the motive for the murder could not be confirmed, He Jingang's suspicions were gradually exposed, and he entered his room after He Jinqiang died, and it can be concluded that he should have been the one who infiltrated the room twice.

"Captain Zheng, the test results of these two letters are out, and there are fingerprints of five different people on the letters." Xiao Liu of the technical department handed the test results to Zheng Wanjiang and told him that the two were his and He Jiaqi's, and that the other three fingerprints should be the person who wrote the letter and sent the letter, and two of them were women's fingerprints. There is no clue in the fingerprint database, who should these three fingerprints belong to? What kind of person is writing the letter, and who is the woman who sent it?

"The shoe prints have been identified, and they are the same number as the footprints left in the room, but they are not the same pair of shoes." Xiao Liu of the technical department said.

At this time, Sun Yaozhang came back and reported the clues he had gotten, He Jingang had delivered goods to Shandong this morning, and he would be able to come back in two days, he investigated his situation with the relevant people, saying that he was a bit of a scoundrel, and ordinary people were unwilling to deal with him, according to some people, on the evening of July 17, he drank wine with Wang Daqing and Chen Xudong, the chief of the security section of the Material Bureau, Sun Yaozhang went to Chen Xuguang to verify the situation, and it was indeed a wine with Wang Daqing and the three of them, which was confirmed in the hotel. That night was Wang Daqing's treat, their relationship has always been good, Chen Xuguang and Wang Daqing know each other or He Jingang's lead, they have drunk together many times before, and it was more than eight o'clock after drinking that day.