Wang Jiangang was in his early thirties, with a thin figure and a very capable appearance. After listening to Zhou Fengshan's words, he opened the file in front of him and introduced the case to Lin Jiangbei.

The case itself is not complicated.

Three days ago, on the morning of February 12, Cao Shangen went to the Cao family ancestral hall to deliver food to his father Cao Ada, who was guarding the ancestral hall. found that the door of the ancestral hall was wide open, his father was strangled to death in the hall, and at the same time, more than a dozen tablets of the ancestors of the Cao family inlaid with gold leaf enshrined in the hall were also missing.

Because Cao Shan Gen himself served as a chief police officer at the Hengheqiao Branch of the Second Sub-bureau of the Provincial Capital Police Bureau, he received professional police training. While he was grief-stricken and called for someone to go to the police station to call the police, he did not forget to stay in the ancestral hall to protect the scene.

The second sub-bureau naturally knew that the Cao family ancestral hall was the ancestral hall of Deputy Director Cao of the Civil Affairs Department, and when it received the report, it sent people to the Cao family ancestral hall and hurriedly called to report to Zhou Fengshan.

Zhou Fengshan did not dare to slack off when he received the call, and immediately ordered the detective captain Wang Jiangang to summon the elite soldiers and strong generals in the criminal investigation department in the bureau, and immediately rushed to the Cao family ancestral hall together with the forensic doctor in the forensic office.

Although Cao Shangen protected the scene very well, several veterans led by Wang Jiangang did not find any useful clues such as footprints and fingerprints at the scene.

The only takeaway is that the murderer is likely to be an acquaintance of Cao Ada. Because there were no prying marks on the doors and windows at the ancestral hall site, and no traces of climbing were found on the outer wall, the only explanation is that Cao Ada's own door opened allowed the murderer to enter the ancestral hall.

According to Cao Shangen's account, Cao Ah Da closed the door of the ancestral hall and went to bed on time at nine o'clock every night, with few exceptions. So at twelve o'clock in the middle of the night, Cao Ada's initiative to get up from the bed and call the door to welcome him into the ancestral hall is difficult to explain if he is not an acquaintance.

In addition, after inventory, it was found that in addition to the ancestral tablet inlaid with gold leaf, a sterling silver incense burner was also lost in the ancestral hall, so it is certain that the murderer's purpose was for money, and the nature of the case can be located as theft and murder.

The bigger bonus is the forensic medicine from the forensic office. In addition to judging that Cao Ada was strangled by a soft rope from behind his neck at about 12 o'clock in the evening, the forensic doctor also found a small amount of flesh and blood fragments from the nail between Cao Ada's right fingernails. The blood type of these flesh fragments was determined to be AB.

According to the judgment of the medical examiner, these flesh and blood fragments should have been left by Cao Ada's struggle when he was gaunted by the murderer's neck, and scratched the back of the murderer's hand or arm with his hand.

According to the information provided by Cao Shangen, although Cao Adaa is sixty-three years old, he is in good health and usually does some heavy work. Considering his height of 1.7 meters and his weight of 68 kilograms, it must have been a sturdy man who could strangle him to death despite his strong resistance.

Therefore, the final conclusion of the medical examiner was that the killer should be a strong male with AB blood type and scratch marks on the back of his hand or arm.

Wang Jiangang immediately made targeted arrangements.

First, carry out an investigation around Cao Ada's social relations, as long as there are scars on the back of the hand or arm, whether it is a man or a woman, they will be arrested and screened first.

Second, order all the eight sub-bureaus under the provincial capital police department to take action to conduct a large-scale investigation of pawnshops and gold and silver jewelry workshops in the area under their jurisdiction, and see if anyone has come to sell or pawn gold and silver artifacts of unknown origin this morning.

Third, a sweep was carried out throughout Hangzhou, arresting all habitual thieves, and encouraging them to provide suspicious clues in addition to letting them pass through the customs one by one and confessing their whereabouts from last night to this morning.

After reporting to Zhou Fengshan for approval, Wang Jiangang issued an order, and more than 2,000 police officers from the provincial capital police station, except for the necessary personnel left behind by the organs, all rushed out to conduct investigations in three directions throughout the city.

What Wang Jiangang didn't expect was that three days had passed, and the more than 2,000 police forces scattered out had found nothing in the three directions he had determined, and no clues related to the murderer had been found......

After listening to Wang Jiangang's introduction to the case, Lin Jiangbei didn't speak, reached out and took the file from Wang Jiangang's hand and carefully flipped through it, the focus was of course on the photos of the crime scene and Cao Ada's autopsy.

After reviewing all the evidence, Lin Jiangbei closed the file and said to Zhou Fengshan, who was looking at him expectantly: "Principal Zhou, judging from the evidence in the file, Captain Wang's investigation direction is not wrong. The only extra caveat is that judging from the autopsy photos, the killer is likely to be left-handed. ”

"Left-handed? How do you tell? A young police officer, sitting at the end of the conference table, couldn't help but ask.

His name is Wan Jiangchi, graduated from the Beiping Higher Police School directly under the Ministry of Internal Affairs, and he thinks very highly of himself, although he is in the base camp of the Zhejiang Police Department, he has always looked down on the graduates of the Zhejiang Police Department. At this time, hearing that Lin Jiangbei could see from the autopsy photos that the murderer was left-handed, he naturally couldn't help but question it.

"You're supposed to be the medical examiner in charge of the autopsy, right?" Lin Jiangbei looked at Wan Jiangchi and took out a photo from the file, "This is a photo of Cao Ada, taken at the scene where the crime was discovered, have you noticed it?" Cao Ada's collar on the right side is upright and covers the neck. ”

Wan Jiangchi was shocked, he really didn't notice this detail at that time.

Lin Jiangbei stretched out his hand and took out another photo from the file, "This is a photo taken by the autopsy." Although the groove on Cao Ada's neck is the same depth on the left and right, there are slight differences in color. The left side is dark and the right side is light color, which also suggests that when Cao Ada was strangled to death by the murderer again, the collar on the right side was actually under the rope. ”

"Anyone who has studied forensic medicine should know that if the rope is padded with a piece of cloth, collar or braid, the groove is interrupted or shallow and not visible. Now Cao Ada's right neck has a collar, but the depth of the ditch is the same as the left. It shows that the force on the right side of the rope is larger. ”

"Considering that the murderer strangled Cao Ada to death from behind, it is easy to judge that the murderer has more strength in his left hand. From this, we can deduce that the killer was either left-handed or had his right hand wounded. ”

Lin Jiangbei said while looking at Wan Jiangchi.

"Considering Cao Ada's height, weight and fitness. If the murderer had an injury to his right hand, it would be difficult for him to strangle him to death under the violent resistance of Cao Ada. Therefore, the murderer is the most likely to be left-handed! ”

After saying his conclusion, Lin Jiangbei asked people to hand the two photos to Wan Jiangchi, "Of course, this is just my judgment based on the photos." Whether it is accurate or not, you still need to go and see Cao Ada's corpse in person before you can make a final conclusion! ”