Hogwarts: The Cat Wizard of the Moving Castle.

Hogwarts Castle, third floor, around the corner to Ravenclaw Tower.

The moonlight shone through the window and passed directly through Ms. Grey's body.

This was the first time Harry had seriously met Ms. Grey face to face, and he had to admit that this lady's appearance was indeed outstanding.

Of course, the reason why he made such an observation was simply because he wanted to see the aura of Ravenclaw in Ms. Grey.

At this moment, Ms. Grey did not care about Harry's gaze. She was staring at the letter in front of her. The letter was manipulated by Harry to float up and landed safely in front of her.

"Are you sure this is something my mom gave me?" she asked.

"Yes, we found it in a strange room in the Room of Requirement," Harry said quickly. "The password to that room is your birthday."

"Haha, of course I know." Ms. Grey raised the corner of her mouth, but there was a hint of bitterness in her brow.

Harry did not see the crying and tears he expected, nor did he see the reasonable but not very human spitting and disdain.

It's a more complicated mood.

Perhaps it is because Ms. Grey and Barrow were both very powerful wizards in the past, which is why they have retained so much of their sanity and thinking over the past thousand years?

After all, as a ghost, Professor Binns is not that complicated.

"Okay, if you have nothing else, you can leave first."

"Well, there's one more thing." Harry pondered for a moment, recalling the teasing look in Uncle Moon's eyes when he entrusted this matter to him.

"That Sir Barrow said he was sorry—"

Halfway through his words, Harry was forcibly blocked in his throat by Ms. Grey's sharp gaze.

"To be honest, I didn't feel disgusted when my unqualified mother changed the password of the laboratory to my birthday. What you said now does make me feel a little disgusted. What benefit did Barrow give you?"

Harry could only purse his lips helplessly: "It's not a big deal, I'm just doing my job. I'm sorry if it makes you feel uncomfortable."

"It's okay." Ms. Grey looked at Harry. The frank attitude expressed by the little wizard made her feel better.

"So you went to my mother's lab, right?"

"Yes."

"Can I go and have a look?" she said suddenly.

"Um, Professor Jones might be in the lab right now, but I think it should be fine."

"Lead the way." Ms. Grey nodded.

A moment later, Harry brought Ms. Grey to the eighth floor where the portrait of the troll beating up the fool Barnabas with a club was shown.

Sure enough, the giant eagle representing the laboratory gate has appeared on the wall.

"Password," it said.

"How strange that I need a password even when someone is around." Just as Harry was thinking this, Ms. Grey took the lead and gave the password.

"Welcome back." The giant eagle said respectfully, and then a deep vortex appeared on the wall.

In Ravenclaw's laboratory, Moon turned back helplessly.

"If that's the case, I feel really embarrassed. I'm already in this secret room."

Harry smiled. "Maybe it's because the vortex doesn't have a door that can make a knocking sound."

"Maybe." Mu En nodded.

Just as the two were chatting and laughing, Ms. Grey's eyes were already attracted by an object shining with golden light.

"You found it?!" She looked at Mu En in disbelief.

"That's right." Moon nodded and raised the crown: "Come to think of it, maybe we should thank Mr. Potter for this."

"Thank you very much." Ms. Grey looked at Harry casually and nodded in thanks, then quickly turned her gaze back to the crown.

It was purely out of courtesy that she said thank you.

But

"Why do I feel a little strange?" She was a little confused.

"Voldemort sealed a piece of his soul into it, so - this is a Horcrux," Moon explained.

Hearing this, Ms. Grey was obviously extremely angry.

"Defilement! This is blatant defilement. How dare he!!"

Unfortunately, apart from being extremely angry, all she could do was be extremely angry.

Although she is indeed dissatisfied with her mother, the fact that she wants to steal it shows how important the crown is to her.

To be honest, she found it hard to accept.

After calming down for a while, she regained her composure and asked as calmly as possible: "What are you going to do with it now?"

"Let's study it." Mu En said casually.

Hearing this answer, she breathed a sigh of relief: "What do you want to study?"

"Soul." Mu En replied, his mouth curled up, revealing his long sharp teeth, and his pointed ears fluttering uncontrollably.

"I've never had such a perfect experimental subject before. I can't even raise any psychological burden."

"Huh?" Harry was a little confused.

"It's not what you think." Mu En explained: "I'm just studying how to separate this soul."

As he spoke, Mu En slapped his head.

"You will be my assistant. Make sure you follow up on this experiment."

"Do I want one too?" Harry adjusted his glasses, looking a little distressed. "Isn't this topic a little too difficult for me, Uncle Moon? And I feel like I can't be of much help."

Soul, he really couldn't think of what he could do in this area.

But serving tea and water is not a big deal.

"Indeed." Mu En nodded seriously and couldn't help but chuckled: "There really isn't much you can do."

Then, he changed the subject and said, "But you must learn this! And there is no better time and opportunity than now!"

"Okay." Harry nodded seriously.

"Soul." Ms. Grey murmured, "Well, if I mean if, in the end, you can really keep the crown safely, then..."

As she said this, she turned to look at Harry.

"I wonder if I have the right to bestow the tiara upon you, Sir Harry Potter."

"Me?" Harry was a little surprised.

"Yes, Professor Jones just said that it was you who found the crown, wasn't it?"

"That's true. But."

"Of course." Moon nodded: "Ms. Grey, you are the heir to the crown, so you certainly have the right to decide where it belongs."

"That's good." Ms. Grey breathed a sigh of relief and smiled a very beautiful but extremely pale smile.

"Thank you for your respect for me, a departing ghost."

Mu En's ears flapped and he looked at the ghost in front of him in confusion.

"Wait, what did you say? A departing ghost?"

Ms. Grey nodded.

"Ah, I have sensed it. But it seems that you are unaware of the comings and goings of ghosts."

"I really don't know." Mu En nodded.

Ms. Grey was not surprised. After all, this was a matter between ghosts, and this concept was extremely confusing to most ghosts who were in a daze.

She also summed up this concept about ghosts bit by bit from thousands of years of observation.

"I think you have all heard a Hogwarts legend," she began.

"If the school dismisses Professor Binns, then perhaps he will disappear soon."