Coming out of the school hospital, Felix stood in front of the window of the castle corridor and saw from afar the little wizards who had returned from vacation appearing at the bottom of the long ramp. Even if he couldn't hear any sound, he could imagine their excited conversation from their body movements.

"School starts tomorrow. I'd better ask Percy Weasley at the dinner. Eleven or twelve years, it's hard not to make associations at this time..." Felix muttered to himself, "And the conversation between Dumbledore and Lupin. Although the specific details are unknown, we can judge something by looking at the headmaster's subsequent behavior."

"I seem to have stepped on the key point of a drama. What will happen next? Is it a mediocre ending or a shocking reversal?"

"Felix,"

Professor McGonagall's voice came from the other side of the corridor. She walked hurriedly, and the hem of her robe fluttered behind her.

"My patronus didn't find you..." She walked up to Felix, her chest heaving violently, and said quickly: "Dumbledore arranged a series of tasks. Hagrid and Snape will pick up students at the station, Flitwick will modify the magic of the school wall, and several secret passages need to be temporarily sealed... He himself has to meet with the centaur leader."

Felix's heart moved, and he asked tentatively: "Did Headmaster Dumbledore mention the order about rats?"

"Oh," Professor McGonagall looked at him strangely: "Dumbledore said you might know, so I don't have to hide it from you. But it's best not to spread it."

"I'm going to the school hospital and the common room to see if Weasley's rat is still there. Oh my God, I couldn't believe it when Dumbledore told me. It might be the Animagus of a dark wizard."

"Is there anything I can do, Minerva?"

"There are two secret passages in the castle that are directly connected to Hogsmeade. We need your help to seal them up..."

Later, in the staff lounge next to the Great Hall, Felix met Dumbledore again. He was talking closely with Professor McGonagall, and the expressions on their faces were very serious.

"Percy Weasley told me that it would be twelve years..."

In addition to McGonagall, he also saw Lupin, whom he hadn't seen for a long time. He looked tired and even more exhausted.

Professor McGonagall was still reporting on the tasks assigned by Dumbledore, "...Hagrid and Snape completed the task very well. There were no accidents in the middle. Flitwick still needs some time. As for the seven secret passages, four were sealed up a long time ago. As for the other three secret passages, the Whomping Willow, you asked me to leave them alone for now. As for the remaining two..." She looked at Felix.

Felix said, "The statue of the one-eyed witch on the fourth floor of the castle has been shut down by a spell, and the one behind the mirror on the fifth floor has collapsed."

After a brief pause, he couldn't help but ask, "Dumbledore, I don't quite understand. Are you worried that Black will come in through the secret passage? Why don't we use this to set a trap?"

Dumbledore shook his head gently, "The risk is too great. They are directly connected to the interior of the castle. I only left the Whomping Willow secret passage next to the Forbidden Forest, which may be able to find Black's trace."

He looked at the three people present and said in a low voice, "I don't want too many people to know before the truth comes out. Of the three of you, one is too deeply entangled with the past, one is my trusted deputy, and the other may have discovered some clues..."

"I want to tell you: Sirius Black's betrayal of the Potters is questionable, because Peter Pettigrew, who was suspected to have been killed by him, may still be alive, and even lived in the Weasley family as Ron Weasley's pet, the rat Scabbers, for twelve years."

McGonagall exclaimed, "Oh my God! Is it true? Albus, you told me before that it was a dark wizard..."

Lupin looked at Felix, who had a calm and composed face, without showing any surprise. As Dumbledore said, Felix Hep was a very sharp person. Is this the most outstanding student in Slytherin in recent decades?

Half a semester had passed, and he had a certain understanding of this frighteningly young professor. When he first learned about Felix's performance in school, he almost dropped his jaw.

This was much more exaggerated than what they had done back then, including the duel that shocked the wizarding world. He had also heard a more complete version of the incident. Since then, he had kept his distance from Felix. He felt that if he had more contact with him, his identity might be exposed...

Dumbledore replied softly, "I'm not sure, Minerva. The two most important people, Black, are still on the run, and the mouse Scabbers is nowhere to be found. He may even never come back..."

Lupin interrupted, "This possibility is very low. I know him. If the mouse is really Peter, he will wait and see in a place that he thinks is safe, not too far away, until things develop in line with his expectations."

Dumbledore nodded and said, "This is also the reason why I don't want to make the secret public. In addition to the lack of evidence, I actually expect Ron Weasley's pet to jump out by itself, which will save us a lot of time."

Professor McGonagall asked uneasily, "Albus, should we tell Potter and the others?"

"It's better not to." Dumbledore rejected her suggestion. "Minerva, for every additional person who knows the secret, the risk of the news leaking out will increase tenfold. Besides, if Potter and the others show any sign of weakness, we may never see the rat again."

He paused. "And the worst possibility is that the rat will hurt them."

Felix suggested, "Perhaps we can reveal some of the information to Miss Granger. We can't always keep an eye on them, and based on my understanding of these three students, they are likely to conduct their own investigations."

Dumbledore showed a distressed expression: "This is indeed a problem, Felix, you are familiar enough with Miss Granger, do you think she is up to this task?"

"I think there's no problem," Felix glanced at Lupin, "She is very good at discovering the truth and keeping secrets."

At the end of this brief conversation, Lupin couldn't help but ask Dumbledore, "Can we notify the Ministry of Magic to show mercy to Sirius..."

"For what reason?" Dumbledore asked back, his azure eyes shining in the dim room.

"All of the above is based on assumptions. It is our guess about the existing doubts, but Black has always been the Potters' secret keeper. Do you agree with this, Remus? I provided this key testimony to the Ministry of Magic that year. According to the information I received, he did not make any defense during the private interrogation. I was completely disappointed in him..."

"We have no evidence. It will be difficult for the Ministry of Magic to accept your testimony based on a photo of an ordinary mouse. And once they know your identity," Dumbledore said, "your words will be greatly discounted."

Lupin's expression darkened. If he wanted to testify, he would have to tell what happened that year, including his identity as a werewolf. The Ministry of Magic's attitude towards werewolves is known to the entire wizarding world.

"Remus, we have done the best we can."

The short meeting was over, and Professor McGonagall and Lupin left. "Felix," Dumbledore called him from behind. Felix looked at the headmaster in confusion.

"If you catch Black, I have no doubt about it. I hope you can control him and don't let others know, especially Severus and the Ministry of Magic."

"I understand the Ministry of Magic, but Professor Snape..."

"The misunderstanding between them is too deep. I'm worried that Severus will do something irrational." Dumbledore showed fatigue for the first time. "I have to think more, Felix." "

...I promise you, headmaster."

Felix turned and left the staff lounge. The lively noise in the hall formed waves of sound waves. Everyone was chatting loudly and excitedly. He saw Fred and George knocking on the goblets and empty plates with knives and forks, making crisp sounds.

...

The banquet ended with laughter and joy. Felix returned to his office and reviewed what happened today in his mind. He found that the key to the whole thing was actually Sirius Black and Scabbers. As long as one of them was caught, the dusty truth would be revealed to the world.

He shook his head and decided to think about teaching in the new semester. The magic in the Mind House had undergone tremendous changes, which gave him a good idea.

"Try it in the seventh grade ancient magic class. The world of thinking is getting more and more wonderful. Even I can't predict what it will become in the end."