Han Bin asked the property management company for a list of the owners of Building Six and their contact information. It would be useful when he checked the surveillance cameras.
As for the delivery cabinets in Building Six, there was a gap at the top of each cabinet that was specially used to deliver letters. The possibility of DNA and fingerprints being left behind was very low, and even if there was, it might not be the murderer's.
After Li Qin and Bao Xing copied the surveillance footage, the investigation of the scene was basically completed. Han Bin brought his men back to the Yu Hua Branch.
When Han Bin returned to his office, he found that Li Hui had already returned from the Huaguang Police Station. "You sure are fast, kid."
Li Hui said, "I came back after handing over the documents to my comrades at the police station."
Han Bin yawned and sat on the chair. "What clues did they find?"
"After receiving Song Jingshan's report, they made a special trip to the neighborhood where Song Jingshan lived and copied the surveillance footage." Li Hui placed a document in front of Han Bin. "This is the file from that time. It has Song Jingshan's statement and the process of their investigation."
Han Bin flipped through the file. Song Jingshan's statement was more or less the same as today's.
However, one statement caught Han Bin's attention. According to Song Jingshan's statement, he discovered that there were more letters in the delivery cabinet on the morning of June 10th. The last time he checked the cabinet was on the morning of June 8th, which meant that the last time the crime was committed was between June 8th and June 10th.
During the statement, Han Bin had asked about the first threatening letter and the exact time. However, Song Jingshan only remembered that he called the police on June 10th and found the threatening letter. He couldn't remember the last time he checked the cabinet.
Other than that, there were no other valuable clues in the file, and the investigation process was very simple.
Han Bin threw the file on the table and glanced at everyone. "Don't say anything else. Check the surveillance footage."
"Not only do we need to check the surveillance footage from the last five days, but we also need to check the surveillance footage from June 8th, June 9th, and June 10th. We also need to compare the surveillance footage from the first and second threatening letters to find common characteristics of the suspects."
"Yes." Everyone split up.
Not long after, Lynch returned from the communications company. He was in charge of investigating Brother Zhao's call records to see if he could find any clues about Brother Zhao from his contacts.
After Du Qi reported to Han Bin, Han Bin asked him to bring Mai Jun along to investigate.
This was also a tedious task.
Han Bin poured himself a cup of tea and stood by the window, thinking about the case.
This threatening letter seemed a little abrupt, but if one thought about it carefully, one would realize that the timeline of the threatening letter was likely before Song Bochen's death.
Song Jingshan had been on a business trip on September 6th, which meant that the suspects could have sent threatening letters on the 6th, 7th, 8th, and 9th. Song Bochen had died on the afternoon of September 9th.
The murderer might have sent the threatening letter first and then killed Song Jingshan's son, Song Bochen, out of revenge.
Song Bochen's death also happened to confirm the saying that his family was ruined.
However, if the murderer had already decided to kill, then what was the point of sending a threatening letter?
Could it be to remind Song Jingshan? That didn't make sense.
Of course, there was another possibility that the murderer had sent the threatening letter after killing Song Jingshan, with the goal of provoking Song Jingshan.
If that was the case, then the grudge between the two of them was huge.
Logically speaking, if there really was such a grudge between the two parties, Song Jingshan should have known about it. However, when Han Bin asked again and again, Song Jingshan said that he didn't have a grudge with anyone.
Han Bin picked up his cup and drank some tea, only to find that the tea in the cup had already been emptied.
Han Bin poured another cup of tea.
Han Bin had another guess. Could this be a cover-up by the murderer?
The murderer's target was Song Bochen, and he also had a grudge with Song Bochen. However, in order to divert the police's attention, he had sent a threatening letter to Song Jingshan. The purpose was to make the police track down the situation around Song Jingshan, thus neglecting the clues around Song Bochen.
If that was the case, it meant that the murderer had started planning three months ago, or even earlier …
At noon, Han Bin had lunch in the cafeteria. During lunch, he talked about the case with Zeng Ping. They were still tracking the two cars with fake license plates. They had already locked on to the general direction and location, but it would take some time before they could find the suspect cars.
After lunch, Han Bin took a lunch break as usual.
At two in the afternoon, he washed his face and refreshed himself.
There had been no progress on the surveillance, and Han Bin was somewhat dissatisfied with their efficiency. In the afternoon, he was ready to check the surveillance.
Knock knock … There was a knock on the office door.
"Come in."
Reuven pushed the door open and walked in. He sighed. "Captain Han, every time I see you in the office, I feel like I'm in a dream."
Han Bin shook his head and laughed. "Did you find anything?"
"I wouldn't have dared to come to your door without any clues." Reuven handed over a document. "We've already checked the two envelopes. We only found one person's fingerprint on the second threatening letter. After comparison, it was Song Jingshan's fingerprint."
"We found four people's fingerprints on the first threatening letter. One is Song Jingshan's, one is Song Bohui's, and the other two's fingerprints. We haven't found any samples for comparison yet."
Han Bin touched his chin. He had asked Song Jingshan before. According to Song Jingshan, when he found the first threatening letter, he asked Song Bohui and his daughter, Song Boxia. In other words, other than Song Jingshan, both Song Bohui and Song Boxia had seen the threatening letter.
Song Jingshan's and Song Bohui's fingerprints were compared, which indirectly confirmed Song Jingshan's words. However, he did not know if Song Boxia's fingerprint was among the two remaining fingerprints.
Han Bin briefly explained the situation to Reuven and asked him to go back and wait for news. Han Bin had to first confirm whether Song Boxia's fingerprint was among the two fingerprints. If it was, he could temporarily rule it out.
This way, when comparing the fingerprints to the database, the workload would be reduced by half. It was also for the sake of the technical team.
After Reuven left, Han Bin clapped his hands and said to everyone, "You should have heard what I said just now, right? The technical team found suspicious fingerprints on the first threatening letter. It's very likely that it was left by the suspect. As long as you find suspicious people from the surveillance, you can compare the fingerprints. Everyone, let's work hard. "
Everyone responded in a scattered manner.
Han Bin did not bother with them anymore. He called Song Jingshan and asked him to inform his daughter, Song Boxia, to come to the Yu Hua Branch.
However, Song Boxia did not come. Instead, Han Bin waited for another guest.
Ring ring ring … Han Bin's phone rang.
"Who is this?"
"Is this Captain Han?"
"It's me. Who are you?"
"Are you investigating the threatening letter case?"
"Yes." Han Bin was a little puzzled.
"I have something to report to you."
"What's the situation?"
The person on the other end of the phone was a little hesitant. "I … Can I tell you face to face? It's a long story."
"Sure, where are you?"
"I'm at the entrance of the Yu Hua Branch."
Han Bin walked to the window and saw a man standing next to the guardhouse. "Come in, I'll get someone to pick you up."
"Okay."
After hanging up, Han Bin called Zhao Ming and asked him to go downstairs to answer the man on the phone.
Not long after, Zhao Ming came in with a middle-aged man in a gray t-shirt. He looked a little uneasy with his head lowered.
"Please take a seat. How should I address you?" Han Bin asked.
"My surname is Hong, my name is Hong Jianying."
"You look a little familiar. Have we met before?"
"Yes, I work in the property management of Rongding Garden District."
"I remember now. I've seen your photo in the property management office. You're in charge of cleaning Building Six."
Tian Li handed her a glass of water. Hong Jianying took the glass with both hands. "Yes, you have a good memory."
She was the cleaner of Building Six. It was very likely that she had seen the person who sent the threatening letter. Han Bin asked subconsciously, "Do you have any leads on the person who sent the threatening letter?"
"I …" Hong Jianying gulped and took a deep breath. "That letter … was sent by me!"
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