Harry, Ron and Hermione trembled and lifted the invisibility cloak.

The three walked forward with sad faces, "Professor..."

Felix looked between the three people, "Miss Granger, Mr. Potter, Mr. Weasley, can you tell me why you are here?"

Harry plucked up the courage to say, "Professor, I, we want to visit Hagrid. You may not know that we are friends with him."

"This is not on the way. You are too deep in the Forbidden Forest." Felix shook his head, "I think your professor should have told you not to trespass in the Forbidden Forest."

Ron hesitated, "Professor, we wanted to find Hagrid, but we saw you by chance and were curious, so we followed you."

"Curiosity," Felix played with the wand in his hand, he looked at the three people, and did not speak.

Huge psychological pressure fell on the three people.

Finally, Hermione said in a crying voice, "I'm sorry, Professor, we betrayed your trust--"

"It's nothing," Felix said calmly, "Adventure is the nature of every little wizard, especially Gryffindor students. But I hope you can define the line between bravery and stupidity. You know, life is only once."

Felix didn't say anything more. He led the three back to the castle.

"Let me think about it. Violating curfew, trespassing in the forbidden forest, following the professor..." As Felix spoke, the faces of the three turned pale, "Ten points will be deducted from each person, and they will be detained for a week."

The trio returned to the common room like sleepwalking.

Seeing Hermione's sad look, Ron comforted her, "It's nothing. It's better than the best result I could have imagined. I originally thought that we would deduct 50 points from each person and be detained until Christmas."

Harry agreed with his face. If they fell into Snape's hands tonight, the consequences would be unimaginable.

While lying on the bed, Ron suddenly said to Harry, "It's so cool, isn't it?"

"What?"

"Professor Hep, whoosh whoosh whoosh! I can't see his movements clearly. I think he is definitely much stronger than Snape, even stronger than Dumbledore!"

"Principal Dumbledore is the strongest." Harry said without hesitation.

"That's not necessarily the case. The headmaster hasn't done it for many years. If it were decades ago, I would definitely not doubt it..." Ron muttered softly, and then gradually fell asleep.

Harry couldn't sleep. The scene of Professor Hep performing magic kept appearing in his mind. From the first spell cast by Professor Hep to the sudden appearance of turning into black smoke, every movement was decomposed and reproduced in his mind.

He saw it clearly.

The next day, Hermione was still a little sad, but she quickly cheered up and even began to discuss the clues of the Chamber of Secrets with them.

The little witch said with a straight face, "It seems that Professor Happ is not the heir of Slytherin."

Ron said, "Don't be so arbitrary. We have only temporarily dispelled a doubt, although Professor Happ is indeed a good person." He also admitted this.

Harry quickly changed the subject. He felt that their behavior of following the professor last night made Hermione, as an assistant, feel a little ashamed.

"I think Malfoy is more likely."

"That's right." Ron said.

"But how can we get him to tell us? He won't admit that he is the heir of Slytherin."

Hermione nodded and whispered, "Perhaps, we need Polyjuice Potion."

"What is it?"

"Polyjuice Potion, it can turn you into another person." Hermione explained to them.

The two still looked confused.

Hermione said angrily, "Don't you all listen to the class? Snape mentioned in class that the brewing process of this potion is very difficult and requires a variety of precious materials. Its formula is recorded in the book "Powerful Potion". "

The three discussed in a low voice.

But then, they got stuck at the first step.

The formula of Polyjuice Potion is hard to get, because the book "Powerful Potion" that records it is in the restricted section of the library.

There is only one way to borrow a book from the restricted section: get a note signed by a professor.

"There is no reason for us to borrow that book," Ron said, "It's not something our grade should touch."

"I think," Hermione said, "if we pretend to be interested in this theory, there might be some hope..."

"Oh, come on, professors won't be fooled so easily," Ron said, "unless they are extremely stupid..."

Saturday morning.

After breakfast, the trio went to the office of the ancient runes professor together - to complete their detention.

Harry lamented that the first Quidditch game was about to start, but he couldn't participate in the training. Quidditch captain Wood was very dissatisfied with this.

Knocking on the door, the three were surprised to see Draco Malfoy was here.

Malfoy was lying on a table with a thick book in front of him. Judging from the page number, he had already turned to the last dozen pages. His quill pen kept copying, and there was a little ink on the tip of his nose.

Harry suddenly remembered that Malfoy was punished to copy books.

Professor Happ closed the door and said in a relaxed tone, "Originally, I was going to stagger you, but after thinking about it, it's too troublesome. I asked, and Mr. Malfoy doesn't mind sharing the same table with you."

Ron suddenly laughed out loud. Looking at Malfoy's expression, it didn't seem like he "didn't mind". He began to look forward to this detention.

Felix conjured up three chairs and placed them in front of them, "I'll go find the materials you want to copy." After saying that, he left.

The four people in the office stared at each other.

Harry said jokingly, "Malfoy, your detention is not over yet? The price is not small." Malfoy

raised his head high, "Harry Potter!" He glanced at the three people, and when he saw Hermione, he seemed to want to say something, but he quickly held it back.

He said a little arrogantly, "At the suggestion of Professor Snape, Professor Happ allowed me to take leave midway, so that I don't have to miss Slytherin's Quidditch training, Potter! I will beat you on the field!"

Harry's mood suddenly turned bad. With the financial support of the Malfoy family, all the members of the Slytherin Quidditch team changed to Nimbus 2001 brooms, which made them extremely fast, like seven light green shadows on the court.

Ron challenged: "The real game is still about skills. Even if you become a seeker through the back door, you will only become a laughing stock, a loser!"

"Shut up, Weasley. Do you have even a single gold galleon in your vault?"

Ron's face flushed, and even his ears became hot. He took out his wand and shouted: "Say it again! Malfoy, say it again!"

Harry and Hermione hurriedly grabbed him. Not to mention the consequences of fighting in the professor's office, even if Ron took action, what would happen? He would spit slugs all afternoon?

Felix came back with a thick stack of parchment. Harry and Ron looked at the materials that were more than a foot high and were in no mood to quarrel.

"I asked Professor McGonagall, she has a batch of information that is too old and needs to be updated, so I took the initiative to take this job," Felix said lively, "It happens to be related to your behavior - the list of banned students and their punishment measures."

Felix put the materials on the table, and a thick circle of dust was raised with a "bang". He waved his wand to "clean it up", and a gust of wind took away the dust. "Let's get started, kids."

Felix sat in a corner of the office, seven or eight meters away from them. "Close your ears and shut your ears." He pointed at himself with his wand, then opened a thick book and enjoyed the leisurely weekend.

At the other end, Harry, Ron and Hermione sat down resignedly. Ron strongly refused to sit with Malfoy, so Harry had to sit next to him.

Harry turned over a piece of parchment and began to copy the information with a quill pen dipped in ink.

Malfoy whispered: "Potter! You know you will lose..."

"Shut up, Malfoy!" Harry roared in a low voice.