Lupin nodded in agreement: "I guess so."

"Dementors don't have eyes. They sense emotions through smell. Humans can't escape their senses, but beasts can. Animagus will turn a person, from emotions to soul, into a beast."

Harry held the amulet, which remained calm. "So, what is Black's Animagus?"

Lupin paused, his face troubled.

"Maybe in your heart, Black is a stupid guy who would never betray you." Harry took out Lupin's wand and played with it in his hand, "But I know that he is a vicious dark wizard."

"He was the secret keeper, so my home address was leaked."

"Even he confessed to the crime and was imprisoned in Azkaban for thirteen years. The evidence is irrefutable."

“I have to keep myself safe.”

"Professor Lupin, you should understand what I mean."

Lupin's face darkened, he lowered his head and sighed: "Sirius' Animagus is a big black dog."

"It's a perfect match with Dementors." Harry raised an eyebrow.

Dementors are creatures that feed on happiness.

Churchill once said, "The depression in my heart is like a black dog, which will bite me as soon as it gets a chance", making the black dog a well-known "synonym for depression".

Lupin explained dryly: "I didn't want Professor Dumbledore to know, that's why."

"Fortunately, Harry, you are willing to trust me on this."

"You know, illegal Animagus, which is also a crime that will get you sent to Azkaban."

"Just in case, I just said just in case."

"Sirius is really not a traitor. This crime alone is enough to send him back to Azkaban."

"And once he goes back, everything will be over."

"You should know that group of people in the Ministry of Magic. After thirteen years, everything has been settled. It will be very troublesome to overturn the verdict, and it will also truly expose their incompetence."

"Even if he is not a traitor, in the eyes of those people, he must always be a traitor."

Harry was stunned.

oh……

I have never thought about this aspect.

When Lupin said this, he remembered that Animagus still had to be registered with the Ministry of Magic.

What is the Ministry of Magic?

He only remembered the fifteen Galleons Scrimgeour had given him.

"You four all know Animagus?" Harry put down his hand holding the amulet. It had been very quiet and had not detected any malicious intent, which made him feel a little relieved and handed the wand back to Lupin.

Lupin was stunned for a moment before he reached out to take it: "All three of them know how to do it."

The past events surged up from the depths of his memory. He slumped back, resting his head on the back of the chair, staring up at the ceiling, and said with a sigh, "They found out that I'm a werewolf, not only did they not despise me, they were willing to be friends with me."

"And in order to accompany me during my most painful days, every full moon, they decided to study Animagus."

"They are all very smart, hardworking and lucky, and they all succeeded."

"Your father, James's Animagus was a stag, very majestic and large."

"Sirius just said it was a black dog."

"Peter has never had a strong presence, but he actually succeeded. We made fun of his Animagus for a long time. He was a mouse, but he had a lion in his heart..."

Harry stood up suddenly and interrupted him: "Wait, what did you say?"

"Peter has a lion in his heart." Lupin was startled and repeated the last sentence subconsciously.

"No, no, no, it's the first sentence." Harry shook his head.

Lupin sounded a little confused, "Peter's Animagus is a mouse, what's wrong with that?"

"Does he have any special features?" Harry asked. "Like any physical disability?"

Lupin shook his head: "Peter is just short, he is not disabled."

Harry frowned. "Really? Like, the right index finger is missing?"

"The index finger of the right hand?" Lupin was stunned. "If you must say that..."

He waved his wand, the drawer opened, and a weathered newspaper flew out and landed in front of Harry.

“This was reported thirteen years ago.”

Harry looked.

There was a huge photo on the front page. It showed a dark, lightless street that was blown to pieces, with smoke billowing and blood and flesh flying everywhere. Sirius Black stood in the middle of the street, numbly allowing the Aurors to do whatever they wanted to him.

The hero Peter who stopped Sirius was blown to pieces in the explosion, leaving only his right index finger.

This is all that remains of him.

"This is really shocking news." Harry read the report from thirteen years ago carefully, word by word. "What kind of mouse is his Animagus? A hamster, a vole, or a squirrel?"

Lupin answered: "It's a shrew."

"Maybe Peter is not dead yet?" Harry looked up and looked at Lupin, but another figure appeared in front of him.

Lupin tilted his head back slightly, surprise rippled across his face: "Not dead? How is that possible? That explosion, he...he..."

"What did you discover?"

Harry invited him: "You haven't been back to the Gryffindor common room for a long time. Do you want to go and have a look together?"

"Peter's Animagus?" Lupin asked impatiently as he followed Harry out of the office.

Harry nodded. "Ron, that's the red-haired boy in the carriage. He has a pet, a hamster, who has lived for thirteen years and is missing a toe on his right paw."

"Ordinary mice wouldn't live that long." Lupin frowned.

Harry nodded in agreement. "You've seen Crookshanks, the half-breed catkin. He reacted to Scabbers, Ron's pet."

"Hermione and I speculated that he might be an Animagus."

Lupin said nothing, remaining silent.

"Caramel, disabled right paw, thirteen years." Harry whistled, "So many coincidences, it's hard not to be suspicious."

Lupin held his wand, a little confused, and his tone was more questioning: "Sirius was caught, he is a hero, there is no need to hide."

“Could it be…”

Harry comforted him: "Think positively, maybe it's just an ordinary mouse, maybe an ancestor of the Weasley family, and Peter is dead."

"It's just that there are too many coincidences. We'd better verify it."

Lupin opened his mouth for a long time before uttering, "Your mouth is much better than your father's."

"Death is not a good thing. It would be a good thing if Peter were alive."

Harry looked back at him, "You would rather believe that Peter was the one who betrayed my father?"

Lupin paused and said nothing.

"It seems that there are differences in closeness and distance even within your small group." Harry smiled lightly.

Lupin sighed, still saying nothing.

Harry asked, "Is Black mute?"

Lupin shook his head: "No, he has always been very eloquent."

"The explosion blew his mouth apart?" Harry asked for details.

Lupin paused: "No."

He was a little confused, why was the focus so strange?

"Then this is very strange." Harry picked up the amulet, which was calm and peaceful. "If Sirius is not a traitor, he has a mouth and it is still intact, so he should speak out about this matter."

"Illegal Animagus..." Lupin began.

Harry interrupted him, "Even if he's an illegal Animagus, the worst that can happen is that he'll go to Azkaban for a few months and then re-register, which is better than staying there for thirteen years."

"Maybe he just doesn't have the brains for it." Lupin thought for a long time and finally said this.

Harry sneered, "Yeah, you have to be so stupid not to be able to defend yourself."

Lupin was speechless.

"But if Sirius is the betrayer," Harry went on, "and Scabbers is Peter, then why is he hiding?"

“On the train, at the opening ceremony, the amulet was vibrating.”

"The bad intentions do not come from you."

"I believe in Ron and Hermione. The malice can only come from the fifth person, Scabbers."

"But why would he have ill will towards me?"

"If he really is Peter."

Lupin didn't know how to answer, so he just followed Harry in silence.

All the way to the lounge door.

"Do you know how to Disillusion?" Harry stopped and turned around to ask.

Lupin nodded and raised his wand: "But why..."

"You come with me. If that man is Peter, he will surely notice something," Harry replied. "If he hasn't run away yet, it would be better if you hide."

Lupin looked at Harry with relief.

He is like James in every way, but luckily his brain is more like his mother's.

With a wave of his wand, his figure slowly blended into the surrounding background.

They climbed in.

Only Ron was lying in front of the fireplace, flipping through a book.

"Where's Hermione?" Harry looked around.

"She went to see Professor McGonagall." Ron put down his book. "It's about the class schedule. She signed up for all the electives, but some of them conflicted with each other. She wanted to ask for advice on how to solve this problem."

Harry pulled a bottle of potion out of the Sorting Hat and made up an excuse, "Where's Scabbers? I met Hagrid on the way back just now. He said that the blood-replenishing potion might be of some use to him."

Ron didn't think there was anything wrong with meeting Hagrid on the way to the eighth floor of the tower. He searched his pockets, but found nothing.

My heart skipped a beat.

"Scabbers?" Ron stood up and searched his bag and robes, but found nothing.

He took a deep breath, ran to Crookshanks who was dozing by the fireplace, grabbed his mouth and tried to force it open: "Did you eat Scabbers?"

"Spit it out now!"

"You bad kitty!"

Crookshanks struggled and slapped Ron's hand with one claw, leaving a shallow scratch. The man and the cat started to wrestle with each other, and without the use of a wand, Ron was even at a disadvantage.

"Crookshanks," Harry called out his name. "Come here. I want to ask you something."

The little ginger cat paused, stepped on Ron's shoulder, walked to Harry's side reservedly, and jumped onto the long table.

Ron gritted his teeth, walked over, and stared at it fiercely, feeling inexplicably sad.