In a place where he was still unaware, Mr. Weasley had already been clearly arranged by his own son.

With the direction of the upcoming investigation confirmed, the tense nerves of Hermione and the others gradually relaxed.

Especially Harry's complexion visibly improved a lot.

He reached into the pocket of his wizarding robe and took out something that looked like parchment, placing it on the table in front of the four of them and unfolding it, while introducing it to Lin Yue and Hermione across from him.

"This is what helped me sneak out of Hogwarts Castle."

Lin Yue lowered her head, looking calmly at the seemingly blank "parchment," and spoke at the same time as Hermione.

"A concealment charm?"

Lin Yue and Hermione's simultaneous response truly caught Harry off guard. He raised his hand to scratch his head and smiled as he admitted, "Well, the content on this is usually hidden."

After saying that, he pulled out his wand and pointed the tip at the blank "parchment." "I solemnly swear that I am up to no good."

Almost as soon as he finished speaking, complex lines and a flurry of moving names slowly appeared on the previously blank "parchment."

Harry pushed the "parchment" toward the center of the table. "This is the Marauder's Map. It shows every secret passage in Hogwarts and the people moving within the Hogwarts grounds."

"But it doesn't extend beyond the boundaries."

As Lin Yue listened to Harry's words, she carefully examined the information on the Marauder's Map. Indeed, it contained information about the entire interior of Hogwarts. Every secret passage and every person currently active was marked.

"Locating spell, identification spell, and some assistance from Hogwarts itself," she stated in a monotone, her eyes slowly moving to the edge of the Marauder's Map.

It was unclear whether it was because the map could not provide assistance beyond the Hogwarts boundaries, but the coverage of the Marauder's Map stopped there. However, there were still some parts outside of Hogwarts Castle included, such as a tree known as the Whomping Willow and the secret passage that ran beneath it.

According to the direction of this passage in relation to the terrain near Hogwarts, the ultimate destination of the passage should be somewhere in Hogsmeade.

Lin Yue quickly constructed a simple three-dimensional map in her mind and combined this hastily created map with the already established terrain map of Hogsmeade. The final destination of the secret passage landed at the Shrieking Shack.

The Shrieking Shack... the place where Professor Lupin and his friends went on full moon nights, used to help Professor Lupin through his werewolf transformations.

This means that Professor Lupin and his friends must have passed through here to ultimately reach the Shrieking Shack back in the day.

Seeing that Lin Yue's gaze lingered on the location of the Whomping Willow, Harry kindly reached out and pointed to the secret passage.

"This secret passage is blocked by the Whomping Willow, so it can't be accessed. I don't know why this passage was built in the first place."

"This passage can be used; we just don't know how," Lin Yue shook her head and flatly countered Harry.

"Why do you say that?" Harry looked at Lin Yue curiously. She wouldn't make baseless claims, so did she discover something?

Lin Yue fell silent for a moment, quickly making judgments in her mind.

To explain this matter, she would need to mention that Professor Lupin is a werewolf.

This situation is clearly something Professor Lupin has kept hidden; it is a personal privacy matter, and if he is unwilling to disclose it, she shouldn't reveal it to others without permission.

However, this matter is also related to Harry's father, James Potter, and Harry himself should have the right to know.

The conflict between these two lines of thought made Lin Yue's brain throb uncontrollably.

"If it's something I shouldn't know, you don't have to say it; I'm just curious," she said.

Seeing Lin Yue's silence and the subtle conflict on her face, Harry quickly said understandingly, "It's okay, Lin Yue, no one is going to force you here. If you can't say it, then don't."

Taken from Royal Road, this narrative should be reported if found on Amazon.

Beside them, Hermione gently wrapped her arm around Lin Yue's shoulder, "That's right, no one will pressure you, Lin Yue. If you can't say it, then don't."

Lin Yue raised her head, her hollow eyes looking at Harry. "It's not that I can't say it, but I can't say everything."

"At least part of this matter is something you have the right to know, Harry."

"I have the right to know?" Harry pointed at himself, bewildered.

He had only asked out of curiosity, and now it had turned into a matter of rights—those are two completely different things.

Lin Yue nodded without changing her expression, pointed at the Whomping Willow, and then moved her finger to outline the direction of the secret passage, completing the lower half of it.

"The direction of this secret passage is probably like this, with an eighty-three percent chance of ending at the Shrieking Shack in Hogsmeade."

"The Shrieking Shack?" Ron clicked his tongue, saying somewhat nervously, "Isn't that the place that's really haunted?"

"That explains why a Whomping Willow is planted at the entrance of this passage, to prevent ghosts from coming out."

"Ron..." Hermione sighed helplessly, "Please think carefully, can a Whomping Willow hit a ghost?"

"Except for Peeves, who is a special case, other ghosts don't have a physical form."

"That's right." Lin Yue nodded in agreement with Hermione's statement.

"Alright."

Ron shrugged his shoulders, not caring much about the mistake that had been pointed out to him. Come on, he made plenty of mistakes all the time; he was used to it. Besides, it was quite normal for Hermione to catch him out on his errors. It would be strange if he and Harry were never called out by Hermione. At that point, one would have to seriously wonder whether Hermione had been hit by the Soul-Binding Curse, or if he and Harry had been.

Lin Yue noticed that no one else had any questions, so she continued to press her finger on the table, pointing at the spot that represented the final destination of the secret passage—the Shrieking Shack. "This place, Harry, your father once went there."

"My dad went there?" Harry looked at Lin Yue in confusion. "I don't really understand. Isn't it haunted? Why would my dad go there?"

Lin Yue opened her mouth but ultimately didn't know how to respond, so she closed it again. "Well," Harry scratched his head, "that's okay. Thanks for telling me this. Maybe I can find some time to check out the Shrieking Shack later."

With that topic concluded, Lin Yue's gaze shifted to other directions on the Marauder's Map. "There’s no Hagrid's hut on here."

Ron squinted at the Marauder's Map and said somewhat regretfully, "I'm a bit curious if he went back after drinking, since he looked a bit drunk just now."

"Indeed, there’s no Hagrid's hut, nor the Forbidden Forest, but there is the Quidditch pitch." Hermione chimed in, pointing at the Quidditch pitch on the Marauder's Map. After saying this, she seemed to remember something and looked up at Harry.

"Harry, can you be sure that Sirius Black or Peter Pettigrew won't sneak into Hogwarts through any of the secret passages on this map?"

"It’s any of the secret passages; your safety is very important right now."

Even if Harry said he couldn't guarantee the safety of any of them, Hermione would suggest handing the Marauder's Map over to a professor. This was to ensure that Hogwarts wouldn't be infiltrated; after all, nothing was more important than the safety of her friends. Of course, if Harry could ensure the safety of these passages... then she would support her friend in enjoying this happiness as long as it was safe.

"I can be sure," Harry said, breaking into a brilliant smile, "this Marauder's Map was given to me by Fred and George, and nothing has ever gone wrong during their use; no one has ever sneaked into Hogwarts through these passages."

He pointed out the secret passages leading outside Hogwarts on the Marauder's Map, lowering his voice as he explained.

"This one we just talked about has the Whomping Willow, so no one can get through."

He paused for a moment and added, "Except for my dad, who somehow managed it." He felt that if he didn't add this, something would be off.

"Then this one," Harry pointed to a passage hidden behind a mirror, "according to Fred and George, it has collapsed and can’t be used anymore."

"And finally this one," Harry tapped on a small statue marked on the map, which had the words 'separate left and right' written in smaller font above it, "is the passage I took to Hogsmeade today."

"The entrance to the passage on the Hogsmeade side is on the cellar of Honeydukes. If someone were to recklessly pass through here, I’m sure the owner of Honeydukes would notice."

After all, not everyone had an Invisibility Cloak like he did, and not everyone could be as flawless in invisibility as Lin Yue and Professor Dumbledore without relying on one.

"The remaining passages are all known to Filch, which is equivalent to being useless."

Harry shrugged his shoulders, and according to his detailed count, these secret passages were actually very safe. Sirius Black could not enter Hogwarts through any of them.

"As long as there are no hidden dangers," Hermione nodded, completely putting her worries to rest.

Linyue also withdrew her somewhat stiff gaze and took a sip of the butterbeer beside her.

Harry carefully put away the Marauder's Map, and Linyue set down her beer bottle, her eyes fixed intently on Harry.

"Harry, you must always pay attention to the Marauder's Map. If either Sirius Black or Peter Pettigrew's names appear on it, remember where they showed up, quickly get away from there, and then go find a professor to go with you."

"I understand."

Harry nodded seriously; once he saw those two names, he would definitely go find a professor. No one wanted the truth to come out more than he did, to see the scoundrel who betrayed his parents brought to justice.

After discussing the Marauder's Map, the four of them chatted and finished their butterbeer together.

After leaving the Three Broomsticks, Lin Yue and Hermione separated from the two boys.

Of course, it was Harry and Ron who took the initiative to leave; they didn't want to stick around and be a nuisance to Lin Yue and Hermione. They knew Hermione's feelings for Lin Yue, so it was better not to be the third wheel.

Following Hermione as they strolled through Hogsmeade, Lin Yue suddenly felt Hermione getting closer, a slightly warm breath brushing against her ear.

This made Lin Yue stiffen for a moment, her cheeks and ears quickly turning bright red.

"Blushing already?"

Hermione chuckled, her breath hitting Lin Yue's ear, causing her face to flush an even deeper shade of red.

"My face and ears feel really hot..."

Lin Yue said this in a calm voice, but if one listened closely, they could detect a slight tremor in her words.

With a light laugh, Hermione gently supported Lin Yue's back to prevent her from collapsing into the snow.

Sitting in the snow in the middle of winter would be very unfriendly and unhealthy for a girl.

At the same time, she looked around, and after confirming that there was no one nearby, she leaned in close to Lin Yue's ear again and spoke softly about serious matters.

"Professor Lupin, he should be a werewolf, right? The Shrieking Shack was where he spent the full moon nights when he was in school."

Hermione spoke very softly; apart from her and Lin Yue, even if someone were to pass by them right now, it would be impossible for them to hear.

"Yes, Hermione is right about these two points."

Lin Yue also lowered her voice and nodded expressionlessly in agreement.

The fact that Hermione could think of these two points was something Lin Yue had already considered. With Hermione's thinking ability and keen observation, she couldn't possibly have missed the fact that Professor Lupin had taken leave every full moon for three consecutive months.

Moreover, he always returned looking extremely weak, which was clearly a sign of a werewolf after experiencing the full moon.

Adding to that was the previous introduction by Senior Penelope about the Shrieking Shack and Lin Yue's own silence regarding the Shrieking Shack and the Whomping Willow passage, it was not surprising that Hermione could guess that it was a place Professor Lupin had used to spend the full moon.

Or rather, it would be strange if Hermione couldn't figure it out, as that would mean a small probability event, which only accounted for 2.1%, had occurred.

"Sure enough, it is like this." Hermione nodded thoughtfully and continued to lean closer to Lin Yue's ear.

She wasn't worried about Professor Lupin's werewolf identity; like Lin Yue, she believed it was something that Professor Dumbledore had arranged in advance.

Since he agreed to let Professor Lupin teach at Hogwarts, it meant he was certain that Lupin would not harm the students.

And over the past three months, she had come to realize what a refined and gentle person Professor Lupin was.

She was also willing to believe that such a professor would never harm students.

"Is that why you didn't tell Harry the whole truth about this matter?"

"Mm," Lin Yue's heart began to race, but her expression remained unchanged, "Based on my analysis, Harry's father, Sirius Black, and Peter Pettigrew should have accompanied Professor Lupin to the Shrieking Shack as friends."

"But to explain this, I would need to reveal the fact that Professor Lupin is a werewolf, which is a personal privacy of his that I shouldn't disclose."

"Pfft," Hermione smiled proudly, turned her head, and gave Lin Yue a solid kiss on the cheek, "Just as I thought, politeness and respect are ingrained in you."

Her breathing gradually became rapid, and Lin Yue felt her heart racing too much; even her eardrums seemed to be beating along with it.

Thump, thump, thump... the sound of her heartbeat echoed in her ears.

"This, this is what I should do, the most basic etiquette rule."

The mechanical words were spoken at this moment with a trembling voice and a softened tone.