"I thought so." Albert couldn't help but smile. He glanced at the passing Ghost and waved hello: "Hello, Sir Nicholas."

"Good morning, my boy. What can I do for you?"

"Do you have time for a photo?" Albert asked, holding up his camera.

"Oh, yes!" Nick thought for a moment and asked: "Do you want me to strike a pose?"

"No, come on, look this way." Albert adjusted the angle and snapped a photo of Nick.

"Is that good?"

"That's enough, thank you, Sir Nicholas."

"You're welcome. I'll be off then!" Nick floated away quickly.

Angelina came over to see the picture Albert had taken, but there was nothing in the photo.

"It seems that muggle cameras can't capture ghosts. Maybe a wizard's camera can." Albert wrote Sir Nicholas Dempsey Porpington on the back of the photo.

"I'm impressed that you could remember his name." Angelina admired Albert's memory, because she would never have remembered all those names.

"It's not the camera." a voice said.

Albert turned around and saw a beautiful red-haired girl who had just entered the Great Hall. She noticed that everyone was looking at her and explained, "The person in the photo needs to be developed with the right chemicals so that they can move. Also, ghosts are spirits, and they can't be photographed."

After that, the girl walked over to Ravenclaw's table.

"Wow, a Ravenclaw student, what a know-it-all." George said in a high-pitched voice.

"That's quite something." Albert said with a sigh, looking at Angelina and inviting her, "Do you want to come with us to explore the rest of the school after you've finished eating?"

"Forget it." Angelina hesitated, but still refused, "I have an appointment with someone."

"That's a shame." Albert picked up a piece of fruit and thought about how to get the developing solution.

The Great Hall was gradually filling up with students, most of whom were new. Perhaps it was because it was the weekend, but the older students were sleeping in, while the new students couldn't wait to explore the school.

After saying goodbye to Angelina, the four of them walked out of the Great Hall chatting. As they passed through the foyer, they all noticed Filch staring at them with his cat in his arms.

Albert stopped and noticed an additional task prompt on his panel:

Maliciousness from the caretaker

You have been targeted by Hogwart's Caretaker Filch. It's time to fight back. During the Night Crawl, escape from Caretaker Filch's pursuit and show him that even if he targets you, he won't be able to catch a single clue.

Reward: 1000 experience points.

After reading the quest, Albert couldn't help but wince. He realised that since arriving at Hogwarts, the quests on his panel seemed to have become a bit too straightforward.

"What's wrong?" Fred turned back, confused.

"Nothing." Albert said, quickening his pace to keep up with the group. The four of them crossed the damp viaduct, and he suddenly asked, "Do you know the incantation for the Disillusionment Charm?"

"What is that?" George asked, confused.

"It's said to be a kind of invisibility magic." Albert explained "I read about it in a book. This invisibility charm can disguise a person or an object, like a chameleon."

"That sounds cool." George was intrigued by the charm. "If we can master it, we won't have to worry about getting caught when we go out at night."

"That's what I think too. At least we won't have to worry about Filch." Albert nodded. He was ready to master the disillusionment charm and go out at night.

"But how are we going to get the spell?" Fred was a little depressed. "Dad might know, but he definitely won't tell us."

"How about asking the professor?" Lee suggested.

"For now, we can only go to the library." Albert said, "Of course, if we can't find it, we can ask the professor of charms, but I'm not sure if he'll be willing to teach us this spell. After all, he might associate it with night walks."

The group looked at each other and sighed helplessly. If they could master this magic, it would make things much easier in the future.

Albert stopped at the edge of the viaduct, leaning over the railing with his hands on it. He remembered that at the end of the novel, Harry Potter broke his Elder Wand here and threw it off the bridge.

What a waste.

The Elder Wand is a good thing. Even if you don't use it, you can hide it in a secret place.

It's a real artefact in the Harry Potter novels. The other one is the Philosopher's Stone. In the end, both of these good things were destroyed.

"Anyway, let's find the library first."

"Even if we find it, we probably won't be able to learn it for a while." Lee said a little discouraged. He hadn't forgotten that he hadn't even mastered the simplest magic.

"Don't say such depressing things." Albert gave Lee a look of disdain and said, "How do you think I learned the other spells?"

"How did you do it?" the twins asked curiously.

"Of course you have to practice a lot, otherwise you expect to learn it right away?" Albert said impatiently.

The four of them chatted about the Disillusionment Charm as they walked, and they wandered around the first floor of the castle for a long time, finding several empty classrooms full of miscellaneous objects and a place that looked like a secret passage, but none of them could open the secret passage, which made the four of them very depressed.

"Most secret passages require a specific password or a special action to open." Albert explained to the three as they walked. "You can only find them by chance or by asking someone who knows about them, but I'm sure they won't tell us."

"The Transfiguration classroom." George reminded him. "I remember Professor McGonagall teaching Transfiguration."

Lee Jordan whispered, "I heard that this class is super difficult to learn."

"It is a bit difficult." Albert had also discovered this when he was self-studying. He had spent the most time turning matches into needles, but after learning it, most of the Transfiguration spells had actually become less difficult.

Of course, it might also have something to do with his panel skills.

The four found the classroom for History of Magic on the second floor of the castle. Fortunately, the classrooms were all marked, otherwise they wouldn't have known where to look.

"There's a wooden door here. I think it's a secret passage." Lee Jordan pointed excitedly to the entrance hidden behind the stone statue.

"It seems locked." Albert took out his wand and used Alohomora on the wooden door in front of him.

"Your spell didn't work." said Fred, reaching out and twisting the door.

"I guess you need a password to open it." Albert muttered.

"What do you think the password is?" Lee Jordan asked in return.

"How would I know?" Albert glared at Lee and thought for a moment before saying, "The most famous password for secret doors in the Muggle world is Open Sesame. This story comes from Alibaba and the Forty Thieves."

At this point, Albert's wand happened to hit the wooden door.

The next moment, the wooden planks on the door were ripped off at the hinges, and it looked like they were about to be broken into a pile of firewood.

The four of them couldn't help but open their mouths wide, their eyes almost popping out of their sockets, not realising what had just happened.