Bruce recorded the chip's low-frequency sound waves and upscaled them all the way to the hearing range of the human ear.

A slow and sparkling sound came from the speaker, and when it made people drowsy, it suddenly increased the tempo, and this strange rhythm made Bruce's frowning brow furrow even tighter.

Bruce knew this frequency, and his temples were beating at this pace for the past two days when he had a headache.

This is not an ordinary chip at all, and he originally wondered, how could it be possible to upgrade the chip in a research institute with the talent of a mad hatter, but the end result was that it was not upgraded much?

This is a chip that can hypnotize people, this kind of sound wave is far beyond the range of human hearing, and even far below the frequency band that is classified as low-frequency noise, and the damage to humans is simply zero, and no one will notice it.

But this thing fell into the hands of the mad hatter, he is an expert in hypnosis, and the chip developed in the name of artificial spinal cord with biomimetic brain waves will not arouse anyone's suspicion at all, and when combined with a certain frequency of low-frequency sound waves, it will hypnotize people unconsciously. He didn't know anything, and he was dismissed:

"Damn it!"

Bruce immediately thought of the headless case, and if his guess was correct, it was probably the work of this chip.

"Bruce?"

Clark looked inexplicably at the man who suddenly put on his helmet and jumped on the Batmobile and galloped away, leaving only the echo of his question echoing through the huge bat cave.

"Why can't he say what he's going to do?"

Helplessly looking at the Batmobile, which disappeared all of a sudden, Clark reluctantly drank the remaining black tea in his hand in one go, then put the teacup on the table next to him and disappeared into the bat cave.

It was so easy to find the Batmobile with superhuman vision, and Clark soon saw the car that looked like a black shadow, and the destination of the car was clear from the sky, which was a bit of a surprise to him.

Gordon sat in his office, flipping through the pile of papers on his desk as usual. There are things that have just happened, and there are things that haven't had time to deal with before. He glanced at the document in his hand. If we can't find any useful clues to solve the murder after a while, the fate of this information will be limited to the headless cases in the archives.

"It's really nerve-wracking, judging from the data, a man is most likely to shoot his wife and children, and then shoot himself, but the scene is like a burglary, how can a person who commits suicide bother to set up the scene?"

Gordon said to himself, this is the biggest contradiction and suspicion in this case, there is no reason for a person who wants to commit suicide to destroy his home like that and then disguise it as if he was a burglary, but there is no other clue at all except the pistol with a man's fingerprint, not to mention....

"The man thought someone had burgled and robbed, so he shot back and killed the family"

The sudden voice frightened Gordon, who was deep in thought, so frightened that he almost jumped up, and after seeing the guy standing in the corner, he said angrily:

"Can't you just burst into someone's office without saying a word, what did you just say?"

After complaining, Gordon realized that what Batman had just said was referring to a case he had a headache just now.

Ignoring his complaints, Batman walked over and took the document from his hand and looked through it, finally his gaze resting on the autopsy report for a moment, and then asked in his characteristic voice:

"How many bullets have been found?"

"Eleven, what's wrong?"

"There's one more bullet in that gun's magazine."

"Yes, did you find anything?"

Gordon looked at Batman strangely, these clues should be on the report, why did Batman use this almost definite questioning method?

"The only pistol on the scene was the German P229 model, which had a magazine capacity of 12 bullets ..."

Batman had gotten the evidence he needed, but it wasn't enough to throw the Mad Hatter into Arkham again.

“... What do you mean.... He killed his wife and children and then committed suicide? ”

Gordon understood the meaning of Batman's words, and the police did include this possibility in the direction of detection, but in this case, there was enough contradiction with the room that was obviously like a burglary.

"Found other people's footprints at the scene?"

Ignoring Gordon's question, Batman asked another crucial question, when he went to the house, it had been searched by the police, leaving police footprints on the ground, and the crowd around the house was so chaotic that it was impossible to tell if anyone had left the scene of the crime.

“..... Nope"

This is also one of the doubts in this case, there are no footprints of anyone else at the scene. When the police first arrived, they were shocked by the chaotic scene in the room, there were bullet marks everywhere on the walls and floors, and there was a mess of furniture on the ground, no matter how you look at it, you would not suspect that someone had invaded the house, but when they investigated the scene, they found that there were no footprints of anyone other than a family of three......

"B, did you find anything?"

Superman also showed up in Gordon's office at some point and raised his questions.

Gordon didn't have time to ask him when he was in the room, and he needed to know the answer to the case now.

"The mad hatter experimented on this man and gave him the hypnotic chip, he really thought that his home was invaded, and he was probably not the only one who was hypnotized, in such a small room, the chip was placed in the mattress, and it is likely that a family of three was hypnotized.."

This is the most likely, there is no sign of outsiders entering that room other than the destroyed environment, so it is likely that no one has entered the house at all in the first place.

It was the surrounding residents who called the police, and they immediately contacted the police at the first shot, and when the police arrived, only three bodies and the destroyed room were left, and no one saw anyone running out of the house in such a short time...

“... Then they thought their home had been burglarized. And then... Oh, my God! ”

If Batman's inference is true, then there weren't any murderers at all in the beginning of this case? With the clues they have now, there is no way to catch the Mad Hatter.

“..... B, what are you going to do? ”

Superman looked at the motionless figure standing in the middle of the room, and from what he knew about him, he should already have a plan or two that could be used......