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Unfortunately, there are no obvious clues on the lawn outside the villa, because the lawn here is made of fake frugal grass. This plant grows most luxuriantly in summer and autumn, with well-developed stolons and strong regeneration. On such a lawn, footprints don't last long unless you can tread them.

Feng Bujue looked up at the window edge and the exterior wall of the villa again, and there was no trace there. However, he was not disappointed at all, because he was in no hurry to find out the truth......

"While it's not dark, I want to survey the periphery of the villa, do you want to come along?" Shut down the window inside Schofield Road.

"Oh! Good. Naturally, Schofield would not pass up the opportunity to ask the detective for advice, and he replied, "Wait a minute. Before he could finish speaking, he turned away from the window, ran to the door of the room, and said a few words to the police officer standing guard. Then he turned back to the window, and climbed out of the window. The detective was also careful, and he was very careful when he made his movements, for fear of touching the blood stain on the window edge and destroying the evidence.

Once outside, Schofield walked around the villa under the guidance of Feng Bujue.

"Mr. Feng, what did you just say...... Chamber? What is the meaning? Schofield asked.

"You've seen Ellen. Poe's "Murder on Rue Morgue"? Feng Bujue asked.

"Uh...... No. "I rarely read novels. ”

"Okay...... Murder in a closed room is one of the so-called 'impossible crimes'. Feng Bujue didn't talk much about literature with the other party, and said directly, "When you entered the house, did you notice the key on the door?" ”

"Well, yes." Schofield replied.

"There are two ways to lock this kind of door. The first is...... The person inside the door. With the door closed, turn the copper cap-shaped latch on the back of the lock counterclockwise; The second is ...... The person outside the door, with the door closed, uses the key to reverse the outside twice times. Feng Bujue explained, "Mrs. Carol, who found the body, used the key to open the door because the door was locked and no one answered the door." ”

Schofield thought for a moment and continued. That is to say...... When the body was found, the doors and windows of the room were bolted from the inside. ”

"In the enclosed space, there was only one deceased, and there was no second person, but the deceased's death showed that it was not caused by suicide." Feng Bujue said. "In this kind of case, the means used by the murderer constitute a secret room killing."

"Oh......" Schofield replied, "Oh," he paused, and asked, "Wait, in the case at hand...... What if the murderer also had the key? ”

"Before you come. I've already asked a few questions in the hallway, and I've certainly asked about that. Feng Bujue replied, "In this house." Each room has two keys, one for the usual one and one for the spare.

The spare keys were all strung together and kept in close custody by Mr. Henderson, the butler. I've seen that string of things. The hoop is dead, and the key on it cannot be removed alone. It's like a medieval dungeon key......

Due to Henderson's sudden illness and fainting, the spare key is currently in the possession of Lord Colston. ”

"And the common keys are all separate ones." As he spoke, he pulled a key out of his pocket, "This is the usual key to the guest room I stay, which I found in the drawer of a table in my room. He paused for a moment and continued, "The maid cleans the rooms that are usually vacant, so they are usually not locked, and the keys are placed directly in the house. ”

Feng Buyi had come to the back of the villa, and after turning a corner, he continued: "Since the common key to the guest room where the crime occurred is in the hands of Ms. Carol, there are three situations in which the murderer has the key...... First, the murderer is Henderson, the housekeeper; Second, the murderer stole the spare key from the butler, and after the killer locked the door, the goods were returned to the original owner; Three, the killer managed to copy a commonly used key. ”

Schofield said, "Hmm...... Do you judge that this room is a secret room, that is, do you think all three scenarios are unlikely? ”

"Yes." Feng Bujue replied, "First of all, in the first case, Henderson's butler is the murderer. He began to explain one by one, "The possibility is almost zero...... Because the old man was so frightened that he had a heart attack and almost died when he saw the corpse. I was close to him and there was a doctor next to me. If that had been faked, Mr. Henderson would have won the Oscar, and Dr. Powell would have been his accomplice.

Of course, there is also a more extreme hypothesis - schizophrenia. Like what...... The killer is another personality of Henderson's butler, and the host personality doesn't know anything about it or something. ”

"Hmm...... I see. Schofield nodded.

"In the second case, the likelihood is also slim to none." Feng Bujue continued, "Because the risk and difficulty of this practice are extremely high, it is just enough to be found when stealing the key, and if it is found when the key is returned, the murder is equivalent to being exposed." And in the time between the time the killer steals the key and the time it is secretly returned, Henderson's butler may find out that the spare key is missing at any time. This period of time happened to be the time when the murderer committed the murder, and if Henderson told the police about the situation after the crime, then there would be no point in arranging the secret room. ”

Without waiting for Schofield to respond, Brother Jue immediately began to say the next one, "The third scenario is more likely, but ......" He suddenly stopped in front of a tree, looked up for a while, and then continued: "...... But the Dennis couple come to the villa only a limited number of times a year, and each time they visit, the rooms they stay in are not fixed. Because Madame Carol is picky, she chooses different room orientations depending on the season.

It was impossible for the killer to predict which room they would be staying in this time, so ...... If it's the third case, it means ...... Except for those rooms that were occupied all year round, the murderer stole the usual keys to all the other rooms and backed them up.

And his or her purpose is to disguise the room as a secret room one day, after killing Dennis. ”

"It's a bit of a strange thing." Schofield answered.

"It's technically possible, and the risks aren't too great." Feng Bujue said, "It's just that the probability of it actually happening is very low, and it's ...... Its purpose is a mystery for the time being. He circled around the tree in front of him a few times, glanced at the second-floor window of the villa, and then continued walking, "To sum up...... Let's rule out the circumstances in which the murderer has the key, and then consider, what other way can this secret room be completed? ”

Brother Jue's tone was like a teacher asking a student, but the fifty-year-old police detective uncle in front of him didn't care, and asked reverently, "It must have something to do with the blood stains on the window edge, right?" ”

"Actually, the method is very simple, it can be done with a relatively tough thread. As long as you do it once or twice, all the rooms with windows in this house can be played like this. Feng Bujue raised his hand and gestured in the direction of the villa, "I've finished reading it outside, let's go into the house, I'll show you." ”