Someone threw a pebble in from the outside, and it was not too big or too small.

After all, this is the home of the head of the Osaka Prefectural Police Headquarters.

If the stone-throwing prisoner had acted with malicious intent, something worse might have been done.

"Well, then let me find him with Heiji!"

Lin Xinyi promised to find the truth with Hattori Heiji, which can be regarded as a practical training for students.

Maorilan doesn't have to participate in this training-

After these days of study and practice, experience aside, her knowledge of trace testing is not much worse than that of Lin Xinyi, a teacher.

"First of all, this stone..."

"There's a little mud on it, and it's still wet."

This point does not need to be taught by Lin Xinyi, with the detective's eyesight, Hattori Heiji quickly came to a conclusion:

"This stone was just picked up by the prisoner from the courtyard."

"Hmm." Lin Xin nodded: "Let's go to the courtyard now." ”

In this way, led by Lin Shinichi and Hattori Heiji, everyone followed out of the mansion in a mighty way.

Walking into the courtyard and coming to the lawn outside the window of the collection room, Lin Xinyi took the lead and stopped:

"Don't get too close, lest you spoil the traces of the scene."

"Since there was fresh dirt on that stone, the murderer should have stood on the dirty lawn and threw the stone."

As he spoke, he took Hattori Heiji carefully around the large lawn.

The view is already poor at night, and the grass on this lawn is very flat and low, so even if there is a lodging formed by stepping on it, it is difficult to see.

Lin Xinyi fumbled and took out a flashlight to enhance the lighting, and at the same time was ready to spend a lot of effort to identify.

Then, I only heard Hattori Heiji say:

"Mr. Lin!"

"I've found the footprints of the prisoner on the lawn—"

"There was a series of traces of the lodging of blades of grass. It should have been trampled on! ”

Lin Xinyi: "........"

I didn't even have this flashlight out, so I'm glad you could find it with the naked eye.

Lin Xinyi has discovered...

In the future, as long as you bring a detective with you, the on-site investigation department can almost be disbanded.

"Good..."

"No one has ever stepped on this lawn this afternoon or evening, right?"

"The grass has a strong self-healing ability, and even if it is stepped on, it only takes half a day to 'stand up' again."

"If it's in a sunny place, with plenty of light, it may only take a few hours for the grass blades to be repaired."

Lin Xinyi took it by the way to popularize science for his students:

"So as long as no one has stepped on this lawn from afternoon to evening, then the 'lodging footprints' on this lawn should have been left by the prisoner."

He asked everyone in the room a cursory question, and the answer was that they had never been to the lawn.

Then the trail obviously can only belong to the prisoner.

"Let's see where this trail goes..."

Lin Xinyi squatted down with a flashlight and observed carefully, and at the same time did not forget to take the test Hattori Pingji:

"Heiji, you should know how to determine the whereabouts of the footprints on the grass, right?"

"Of course."

"Tracking is a basic skill of a detective!"

Heiji Hattori has a lot of knowledge in this area:

"It is mainly judged according to the direction of the grass lodging, combined with the ground traces."

"For example, after a person has stepped on this relatively low grass:"

"The grass will be pressed forward at the tips of the feet, and there will be traces of sliding on the tips of the feet;"

"The grass at the heel will also fall forward, and the tip of the grass will break forward."

"On dewy nights like now, you can find mud sticking to the grass under the blades of grass."

"That's right."

Lin Xinyi nodded with satisfaction:

"Let's keep looking."

"Take another tape measure and measure the prisoner's steps."

Footprints on the lawn are almost impossible to extract, and many footprint features are not visible because of the grass as a mat.

But at least, the distance between each lodging footprint, that is, the step size, can still be seen.

"The distance between the heel edge of the first footprint and the heel edge of the third footprint is the single step length for the three footprints left in a row."

"Substitute 'footprint length' and 'single step length' into the formula..."

"You can roughly calculate the height of the prisoner."

Lin Shinichi taught Hattori Heiji like this.

And Hattori Heiji was sent by him, doing the drudgery of lying on the ground and measuring the step length with a tape measure:

Anyway, he has good eyes, and the measurement error is small.

"Step size +1/2 footprint length."

"In this case, the prisoner's height should be 165cm."

Heiji Hattori gave a conclusion.

But Lin Xinyi shook his head and said:

"In our line of work, we must always be strict in our words."

"The number can't be accurate to 165cm, because the height calculated in this way tends to be very incorrect."

"It should be said that the height of the prisoner is there."

"He's in that general range."

"Leave an error of 10cm?" Hattori Heiji was a little puzzled: "The scope of the investigation is so large, isn't it the same as not speculating on height?" ”

"To be cautious, the error just has to be a little bigger."

"It's better to check more targets than to accidentally miss them."

Lin Xinyi said in a calm tone:

"Of course, in the actual investigation process, priority is given to finding targets that are closer to the calculation result of 165cm."

"Well, I see."

Hattori Heiji understood what Lin Xinyi meant, and then followed Lin Xinyi and followed the footprint to check:

Soon, in the middle of the lawn, they found a strange footprint:

"This lawn has been shoveled to a little bald."

"And the grass stalks are not lodging, but broken, and many broken blades of grass flew in front of the footprints."

"And the front of this kick mark is pointing in the direction of the collection room."

"Could it be that the prisoner..."

Heiji Hattori imagined the scene at that time:

"The prisoner didn't throw the stone in."

"He kicked the pebbles off the grass before they flew to the collection room and smashed the glass and vase?"

"Chances are..."

Lin Xin nodded, and his expression became a little strange:

"Moreover, that prisoner's strength is really not ordinary."

"Putting aside this piece of turf that he was about to shovel bald..."

"Just use this kick to kick a small pebble out of a speed comparable to that of a slingshot..."

He paused slightly, and the figure of Mao Lilan flashed in his mind again:

"I'm afraid the power needed is not something that normal people can have."

"Uh..."Speaking of this, Hattori Heiji couldn't help but flash the terrifying image of a muscular monster force girl in his mind.

"Let's keep reading..."

The two of them shook their heads at the same time, abandoning the instinctive associations in their minds before continuing to investigate.

And following the trail of lodging footprints, Lin Shinichi and Hattori Heiji found out:

"This trail is all sorts of tracks, and it's all over the place..."

"Is the prisoner going around in circles on the lawn?"

"No..."

Hattori's detective mind quickly reacted:

"Outsiders break in to commit crimes, and it is estimated that there will not be time to wander around on the lawn."

"So this prisoner should be our own person in the family..."

"He was supposed to be walking on the lawn!"

"But somehow, while he was walking, he suddenly kicked a pebble out and smashed my dad's favorite vase."

"Yes..."Lin Xinyi nodded approvingly:

By now, the situation is very clear.

It was most likely an accident.

The prisoner should have been in the mansion by now, but he didn't have the courage to admit that he had accidentally broken the vase.

"Let's take a look..."

The urgency of the case is no longer there.

It doesn't matter whether the prisoner is found or not, the next thing to do is to carry out teaching and training.

"Mr. Lin!"

Detective Heiji Hattori soon made a new discovery:

"Look here, this location near the road—"

"Looks like there's a dirt footprint!"

There is a small area at the edge of the lawn that is not covered with grass and is "bald".

When the prisoner left the lawn, he stepped on it, leaving a dirt footprint.

Dirt can clearly retain various footprint characteristics, so the significance of soil footprints can be much more important than grass footprints.

But it's a pity...

This uncovered dirt area is only a small patch.

The footprints left by the prisoner when he stepped on it were mutilated, with only half a footprint on the paw of his hind foot.

"But that's enough."

Lin Xinyi was overjoyed and said:

"Just a mutilated half-dirt footprint can help us read a lot."

"For example, this half of the hind footsteps..."

"First of all, we can roughly see the shoe size - this shoe size is not too big, which means that the prisoner's feet are relatively small."

"And more importantly, near the heels, there are signs of 'inside bulldozing'."

"Inside bulldozing?"

Hattori Heiji observed the footprint and asked thoughtfully:

"Mr. Lin, do you mean the ridge-like mound of soil on the heel part of this footprint?"

"Yes."

Lin Xinyi explained in detail:

"Because of the physiological characteristics of women, when women walk, their heels tend to move slightly inward and forward along the ground."

"In this way, a ridge-shaped mound forms on the inside of the heel of the footprint, and this ridge-shaped mound is called 'inner bulldozing'."

"And 'internal bulldozing' is one of the important characteristics of judging women's footprints."

"That is to say..."

Heiji Hattori quickly reacted:

"This prisoner is actually a girl?"

"Hmm." Lin Xin nodded in confirmation.

And after coming to this conclusion, the expressions of both of them couldn't help but become strange:

Female.

The height is around 165.

The strength is not like that of a normal person.

It's your own people in this house.

"Isn't this prisoner..."

Lin Shinichi and Hattori Heiji flashed a figure in their minds at the same time.

So they...

One looked at Maolilan.

One looked at the mountains and leaves in the distance.

：。 ：