"Damn, what's the principle?" Li Dongliao put his head under the mirror and studied it carefully.

This kind of invisible word is a bit like the kind that you will play in the secret room game.

Writing with a special material of invisible ink can make the words emerge as long as a specific mechanism is triggered.

In order to look more closely, Li Dongliao brought the cup closer together.

As the heat in the cup continued to rise, the fog on the mirror grew larger and larger, and the words on the mirror disappeared instead.

Those words flashed in a flash, as if they had changed a trick in front of everyone, and then disappeared in an instant.

"What's going on?" Li Dongliao's brain was racing.

He put on his gloves and carefully touched the surface of the mirror, then put them under his nose and sniffed them, smelling a strong smell of raw shallots.

Li Dongliao has been very repulsive to green onions since he was a child, and immediately retched softly after smelling it.

"Mom, why does this mirror smell of green onions!"

"Clever tricks." Tan Wan raised the corners of his mouth and smiled, staring at the mirror and said thoughtfully.

"Having the smell of green onions is a clever trick?" Li Dongliao's face turned hideous, "What are you talking about?" ”

"Haven't you heard a joke on the Internet?" Tan Wan crossed his waist with one hand, and gently patted his back with one free hand to make him feel better.

"What?" Li Dongliao was dissatisfied and had a little temper, "What kind of dumb riddle to play with me, talk about it quickly!" ”

"The joke says that if you're staying in a hotel on a business trip, you can write on the mirror with lemonade.

Write things like 'I died so miserably' and 'I died so unjustly'.

The lemonade will run down during the writing process, and there will be no trace when the lemonade is completely dry.

However, as soon as the guests who stayed in later took a bath, the temperature in the room would rise, and those words would be re-revealed, so that later people would feel that there was an illusion of ghosts in the room. ”

Li Dongliao blinked and looked at Tan Wan, so cold by this joke that he didn't know what to say.

"So..."Li Dongliao asked tentatively, "The word came out just now, also because of lemon?" ”

"It's not a lemon, I guess the murderer should have used green onions." Tan Wan clasped his hands around his chest and said confidently, "Don't you smell the green onions?" ”

"Can green onions and lemons have the same effect?" Li Dongliao asked again.

"In fact, the fundamental principle is to make the surface of the mirror a little more hydrophobic, when the rest of the mirror is covered by water vapor, the painted area will have less water vapor, so as to display the image.

It's not an advanced method, once the heat brings enough moisture, those words will disappear. ”

Speaking of this, Tan Wan added: "It's the same as the situation." ”

Those words should have been written by the murderer, just like the words that the murderer left at the murder scene after killing Gao Mizi, but the method used was different.

Li Dongliao: "But if you want to say that this is a case committed by the same murderer, why are the styles of murder so different?" ”

Tan Wan: "What do you say?" ”

"The murderer tortured and tortured Gao Meizi, but he ...... this Liu Xiaoyan," Li Dongliao said this, and suddenly paused.

He originally wanted to say that the murderer's treatment of this Liu Xiaoyan was very 'gentle'.

But the murderers have killed people, and killing a person is not gentle in any way.

Li Dongliao adjusted his rhetoric for a moment before continuing to speak: "The murderer only drowned this Liu Xiaoyan, at least leaving a complete whole body for the deceased.

Instead, compared to the scene of Takamiko's death, the bathroom at the scene of the crime was also cleaned by the murderer. ”

At this time, Tan Wan saw a thin and dry little old man, shaking his hands behind his back in the rental room.

Tan Wan was attracted by him and pointed: "Who is this?" ”

The police officer who was taking the record replied: "This is the first witness, and he is also the landlord of this rental house. ”

"What do you call it, old man?" The little old man's ears were not very good, and he shouted a few times before he responded.

"Hey! My surname is Shi! The little old man said loudly.

Talk about understanding this situation, generally people with bad ears will speak louder.

Because they themselves cannot hear their own voices.

Tan Wan also raised his voice and said loudly in his ear: "Uncle Shi, how did you find the body?" ”

Uncle Shi: "What are you talking about??" Be louder!! ”

Tan Wan sighed a long sigh, it was too hard to talk to this little old man!

Policeman: "That's right, the sound insulation of this building is not good, the old man received a complaint from the guests downstairs, saying that the noise of the quarrel upstairs was too loud, let him go upstairs to have a look." ”

"Who's living downstairs?" Tan Wan asked, "When is the complaint?" ”

The police officer looked down at the transcript and read, "It seems to be around four o'clock in the afternoon." ”

Tan Wan raised his hand and looked at his watch, it was nine o'clock in the evening.

While they were talking, Lao Zhang had already conducted a preliminary inquest of the body.

In addition to the strangulation marks found on the back of the neck, the deceased Liu Xiaoyan also found small bruises on her arms and near her collarbone.

It is speculated that the impact caused by the deceased choking on water and resisting when the murderer committed the murder.

Other than that, no other skin injuries were found.

"Primarily, it seems to be drowning, and the specific results will be discussed when I finish the autopsy and issue an autopsy report."

Talking about the night, he nodded in response: "I'll go back to the bureau and wait for you to report." ”

As soon as the words fell, Lao Zhang was heard sighing, he took off his gloves and patted Tan Wan's shoulder: "The team is young and can still work hard, I have to rest and rest as an old bone." ”

Liu Xiaoyan's body was transported back to the police station, and Tan Wan went down another floor, knocking on the residents directly below Liu Xiaoyan.

The door was opened by a small couple, the woman was wearing sexy suspender pajamas, standing behind the man.

The man saw that it was a man and a woman who knocked on the door, and after looking at Li Dongliao, he blocked his wife with his body.

"Who are you?" The man's tone was not very good, "The quarrel is still endless?" ”

"We are the police of the 1st Criminal Investigation Brigade, and we are here to ask a few questions." Talk about showing your ID later.

When the man heard that it was a policeman, his voice was more polite: "Uh, what's the matter?" ”

Tan Wan took back his documents and asked, "Liu Xiaoyan, who lives upstairs with you, how much do you know about this person?" ”

The woman replied: "That woman has been here for a few years, and the house she rented is not waterproof well, and it has been leaking. ”

"Hmm." The man affirmed the woman's words and asked, "What's wrong with this man?" ”

Li Dongliao: "She died, and was found dead in the bathtub by the landlord." ”