The deceased in this case was surnamed Dong, and he was the owner of a club. Let's call him Boss Dong.

Boss Dong was 40 years old, unmarried, and had several businesses under his name. One of them was a club called "Jin Cui Hua Palace", which was a famous high-end consumption place in Heping City.

Three days ago, he was found dead in a luxurious suite in the club with a severe head injury. The murder weapon was a ceramic work in the room, which had been broken into pieces.

The fingerprints of the suspect Tan were extracted from the fragments.

The report was made at 11:12 p.m., and the reporter was the person in charge of the club. He said that the deceased had told him that if a certain big guy came tonight, he would go to say hello.

When the person in charge knocked on the door, he heard the sound of porcelain breaking, and there seemed to be a dispute inside.

Then suddenly, there was no sound.

The person in charge was worried, so he found the security captain and knocked on the door again.

Still no response.

The two finally chose to pry the lock and force the door open. They found the deceased lying on the ground with blood flowing from his head, while the suspect was sitting on the sofa with a blank expression.

So they called the police.

The police arrived at the scene at 11:40, started a routine investigation, and detained the suspect Tan.

According to Tan's own account, he was one of Boss Dong's mistresses, and received a call from him tonight to go to the club to keep him company.

He arrived at the club at 8:40 pm, chatted with his friends for a few words, and went into the room to prepare at 9:30.

At 10:05, Boss Dong finished a drinking party downstairs and entered the suite drunk.

Tan said that the deceased was not very drunk at the time, and was still rational, and had sex with him. Afterwards, the deceased suggested drinking, but after just a few sips, he felt extremely uncomfortable and thought he was going to die.

In a hurry, he seemed to push something down, and then fell into a coma.

After an unknown amount of time, he slowly woke up and struggled to ask for help. Unexpectedly, when he came to the living room, he saw the deceased on the ground at a glance. He thought that both of them had committed murder, and his first reaction was to leave the room.

But his body had not fully recovered, and his legs and feet were weak, so he had to change his mind and go to get the mobile phone on the sofa.

At this moment, the door opened, and the person in charge and the security captain rushed in.

After being arrested, Tan has always denied that he was the murderer and insisted that he was innocent.

The forensic doctor then performed an autopsy.

The autopsy report confirmed that the wound on the victim's head was the fatal wound, and its shape was consistent with the broken pottery. The time of death was within 1 hour, that is, from 10:40 to 11:10.

During this time period, only the suspect and the victim were in the same room.

Seeing this, Jian Jing couldn't help but flip through the back: "Is there a topographic map?"

"No." Ji Feng took out a piece of white paper and drew a simple map for her. "Let me put it this way. Although the crime scene is a busy club, according to investigations, the floor where the deceased was is the top floor, which can only be reached by taking a dedicated elevator. You need to swipe a card to open this elevator, and outsiders cannot come in."

Jian Jing asked: "Is there any surveillance?"

"Where can there be surveillance in a place like this?" Ji Feng said, "Among the people in the club that day, there were a total of six people who could enter this floor. In addition to Tan, there were also the person in charge, the security captain, the secretary, the finance, and the business department manager."

He drew the layout of this floor.

Suite...Office...Electricity

Room...Lounge...Elevator

The person in charge, the security captain, and the business manager, when not patrolling the club, will rest in the lounge. The secretary and the financial officer share an office.

But they are not very suspicious, because the scene is a secret room.

The door is locked from the inside, and it cannot be opened even with a key from the outside. The police have checked and found that there is no secret passage at the scene. The windows are also floor-to-ceiling windows, and only a small gap can be opened for ventilation. Even a fat cat cannot get in.

In this way, Tan is not only the most suspicious person, but also the only suspect.

Jian Jing asked, "Do you think he is not the murderer?"

"I didn't say that." Ji Feng corrected, "I have repeatedly emphasized to him that only by confessing with a good attitude can he be sentenced leniently, but he still refuses to change his words and insists that he is not the murderer." Jian

Jing nodded, "It is indeed very strange."

Generally speaking, with the evidence in front of you, it is meaningless to resist, it is better to confess and get a light sentence. In a case like this where the situation is clear, if the suspect refuses to confess, everyone will murmur and worry that there is something else going on.

She flipped through the confession: "There is not much information, can we go to the crime scene..."

Before she finished speaking, she suddenly heard Lao Gao's voice: "Ji Feng, Prosecutor Zhu is here."

Jian Jing looked over and saw a woman in a blue shirt and hip skirt walking in, her hair loosely tied into a low ponytail, low-heeled black leather shoes, and a briefcase in her hand.

Dressed like this... from the Procuratorate?

"Hello, Officer Gao." Prosecutor Zhu nodded slightly, looked at Ji Feng, and went straight to the point, "How is the June 15 case going?"

Ji Feng: "He hasn't admitted it yet."

Prosecutor Zhu frowned: "The evidence is so complete, why don't you admit it?"

Ji Feng said: "We are investigating it now, just wait two days, give me some face."

"Official business is official business, and personal relationships are personal relationships." Prosecutor Zhu was impartial, "Hand over what should be handed over, we are also very nervous about the trial, don't waste my time."

Ji Feng said: "There are still a few doubts, I will give them to you as soon as I figure them out."

Prosecutor Zhu: "What doubts?"

"The murderer has not confessed." He said, "Other people are also suspects, right, Teacher Jian?"

"Ah?" Jian Jing was cueed while eating melons, and she blinked innocently, "What?"

Ji Feng: "Tell me what you think."

Talking about the case, Jian Jing quickly returned to her seriousness and said thoughtfully: "At present, the key to locking the suspect is actually the secret room. If it is not a secret room, the suspect's testimony is not surprising - by the way, did the suspect's blood test find anything abnormal?"

She didn't have time to see the rest, but since he said so himself, he would definitely do a blood test.

Sure enough, Ji Feng said: "He said he was poisoned, but we didn't find any toxins in his body, but the alcohol content was relatively high."

"Is it possible that it was not found?" she asked.

He was very cautious: "Blood tests can only check routine conditions. It is indeed possible that they did not find particularly rare or obscure components."

She hooked her finger: "What about the Window of Judas?"

"Impossible." He denied it outright, "The conditions are not available on site."

Jian Jing asked: "What about the agency?"

"Take you to the site?" he asked.

She was waiting for this sentence: "Okay, let's go."

Ji Feng immediately said to Prosecutor Zhu: "Look, I'm still checking the suspicious points here. Give me two more days. What if it's a false case? It's someone's life."

Prosecutor Zhu hesitated for a moment and said, "You want to go to the crime scene? I'll go too. If you can convince me, I'll give you a few more days."

Ji Feng: "...Okay."

The three got in the car, and Jian Jing and Prosecutor Zhu got to know each other.

"Zhu Yanan." Prosecutor Zhu introduced himself, "I'm from the Procuratorate's Monitoring Division, the person in charge of the June 15 case."

"Jian Jing," she said, "I... was just passing by."

Who would have thought that Prosecutor Zhu was very polite: "I've heard of your name, and you've participated in the detection of many cases. Do you also think this case is suspicious?"

Jian Jing said, "The suspect's attitude is very strange."

Prosecutor Zhu said, "I have studied this case carefully. There are two keys, one with the security guard and one in the deceased's hand. And after the door is locked from the inside, it cannot be opened even with a key from the outside. Although the window can be opened, it is on the seventh floor outside, which is very far away from the door, unless it is like the trick described in the novel, creating a hidden mechanism to lock the door."

"It's too difficult to operate, and the probability of success is too small." Ji Feng interrupted, "Of course, this possibility cannot be ruled out."

Jian Jing: "Let's take a look at the scene first."

The car drove to Jin Cuihua Palace. Because the boss was killed, the store was still closed for rest. Only the neon lights on the outer wall were still brightly lit, with golden, red, and green lights intertwined together, magnificent.

Jian Jing paid attention to the environment along the way, and indeed only the dedicated elevator could reach the top floor.

Now there was no one upstairs, and it was eerily quiet.

Ji Feng turned on the lights and lifted the warning tape to make it easier for the two people in skirts to get through. Prosecutor Zhu got through neatly, but Jian Jing's hair accessories were more fancy and got caught.

"It hurts!" Jian Jing covered her head and couldn't help complaining, "You are so tall, why can't you hold it higher?"

She had a bow-tie bun today. In order to make her head fluffy, she had to pull her hair back after tying it. The hair inside was also decorated with shiny chains. Now the hair was caught, it hurt like hell, and she couldn't pull it hard, she had to pull it out strand by strand.

"Don't make it so complicated," Ji Feng blocked her hand, and with the advantage of height, he lowered his head to study for a while, accurately found the hooked hair, and pulled it out, "Okay."

Jian Jing raised her mobile phone to take a look, and carefully pulled back the bulging hair.

Ji Feng put on gloves while waiting for her. When she finished, he took out the key and inserted it into the door lock.

Jian Jing's attention was immediately focused: "Is this the original lock? Didn't they say the door was pried open?"

"No, the original lock was in the bureau, and this is the same model that was replaced." Ji Feng broke off the lock inside, "See, it's locked from the inside, and it can't be opened even if the key is inserted from the outside."

As he spoke, he showed her a close-up photo of the door lock. There were traces of violent prying on the outside of the lock, but the inside part only had some daily friction, and there were no traces worth paying attention to.

She nodded, put on her shoe covers and went in.

This is a large suite in the shape of a 7, with a living room outside. The first thing you see when you enter the door is a large, magnificent screen, with the white lines of a corpse visible on the left side of the screen.

As she approached, she could make out that the body was lying sideways in front of the sofa, head down, with hands on the head. Porcelain shards were shattered beside him, and from the photo, the bottom piece was stained with blood.

Looking at the surrounding furnishings, they were also extremely gorgeous. The TV background wall was made of black cloud-patterned marble, and there was a large wine cabinet in the corner.

The left side of the living room led to the bedroom, and on the right side was a huge glass window that could only be opened to a gap of two fingers wide.

Jian Jing looked up. From the central ceiling hung an intricate and gorgeous crystal chandelier. Apart from that, there was no particularly tall furniture around.

She asked, "Has it been checked up there?"

Ji Feng replied, "I've checked it, there's a lot of dust on it, and no one has touched it in a short time." Jian

Jing nodded. The only thing in the living room that was easy to tamper with was the chandelier. If there was nothing abnormal, using the mechanism to make the porcelain fall from a height and crush the victim to death would not work.

Ji Feng seemed to understand what she meant and said, "The technical department has done an experiment. According to the way the porcelain was broken, it shouldn't have fallen from such a high place."

"You've thought about it very carefully." She said deliberately, "Do you think you don't need help?"

"Tsk, I can't slack off at work," he said, "It's just to rule out a few possibilities."

"What else?"

Ji Feng said, "I searched the entire room, the ceiling, the vents, the glass windows, the top floor, and found no trace of anyone. So, it's impossible to hang down from the upper floor with a rope, it's impossible to climb up from the lower floor, and it's impossible to go in and out through the ventilation duct."

Jian Jing nodded repeatedly, "I understand, what you mean is that the murderer can't enter the room by any means other than the door. If the murderer wants to kill the victim, he must be in this room, and he can't complete this murder outside the room."

To be honest, Ji Feng's personality is a bit dog-like, but he is absolutely meticulous in his work. His investigation work is boring and dull, unlike the detective's reasoning process, which is exquisite and unique, but it can reduce detours very well.

Excluding the above, there are very few possibilities left.