A day at Hogwarts.

"Fred, George, what are you doing here?" Albert pretended to be surprised as he looked at the roommates who were pouting and mopping the floor.

"Mopping," Fred said dryly.

"By the way, why didn't I know you had become so industrious." Lee Jordan looked at the twin brothers with a gloating expression.Big dung bombs are not easy to clean, especially since Filch hadn't given them any detergent, and mops and rags wouldn't get them clean at all.

"This is the consequence of throwing big dung bombs in the corridor." Filch said to the people who stopped to watch, "Don't think you can escape if you do something bad."

"Don't worry, I will take time off for you in Defense Against the Dark Arts class." Albert reached out and patted the twins' shoulders, comforting.

"Why do I always think you're a little gloating?"

"Is there?" Albert looked sideways at Lee Jordan and said, "No, who told them to throw big dung bombs in the corridor and get caught by Filch?"

"I thought they would secretly throw big dung bombs into the corridor." Li Jordan was also very puzzled. Isn't this causing trouble for himself?

Of course Albert knew why, and if Filch wasn't around, he wouldn't mind using a descaling spell to save them trouble.Unfortunately, Filch was staring right next to him, and he wasn't allowed to do that either.

It took Fred and George hours to completely clear the hallways and offices of the dung bombs.

For this, they also missed lunch.

The two people with backaches only got a sandwich from the kitchen, and now they are sitting under a tree to eat.

"Where's the stuff? You got something, don't say anything." George put all the sandwiches in his mouth into his mouth, looked at Fred, and waited for the other party to take out the prohibited items he got in the drawer.

"Got it. Look, it's the thing." Fred took the envelope from his pocket and handed it to George.

"What is this?" George looked at the old-looking envelope and turned it upside down. There was no sender, and two sentences were written on the envelope: I solemnly swear that I have done nothing good, and the prank is over!

"Look at what's in there?"

George hurriedly opened the envelope and found a large, square, very old... parchment inside.

Well, just a piece of old parchment.

Only, nothing was written on the parchment.

"What is this?" George looked at his brothers suspiciously. They could all feel that there was a secret on this parchment, otherwise Filch would not have put it in the confiscated, highly dangerous drawer.

"Will you need a password?" Fred suddenly remembered the two sentences on the envelope, "I solemnly swear that I have done nothing good."

"Stupid, wand, wand," said George, holding out his wand against the parchment. "I solemnly swear I have done nothing good."

Lines of ink began to appear where the wand had just touched, cobwebs meeting each other on the parchment, crossing each other, and beginning to extend to every corner of the parchment.

"You really need a password!" The twins' faces showed unconcealed excitement.

Sure enough, this parchment hides a secret.

"Look what is this?" Fred stared at the surface of the parchment and noticed a line of writing began to appear above the parchment:

Auxiliary Providers for Magical Prank Makers: Moonface, Wormtail, Bigfoot and Prongs Gentlemen proudly present the Marauder's Map.

"Marauders map?" the twins read in unison. "This old parchment is actually a map."

"George, look, the ink dots on the parchment can move." Fred shared his discovery in amazement.

"Nonsense, otherwise why would it be called Marauder's Map."

The two got together to study the secrets of the Marauder's Map, and soon found that the map was a detailed drawing of Hogwarts Castle and the specific location of each secret passage and the password to open the secret passage.

Finally, there is no need to worry about finding the location of the secret passage and being unable to open the secret passage.

On top of that, it also marks everyone's location with ink dots.

Albert came out of the library and seemed to be preparing to return to the lounge. Filch was on the fourth floor, and Peeves, the teasing ghost, was on the sixth floor.

"George..."

"Fred..."

"You talk first..." The two of them said in unison, and couldn't help laughing after facing each other.

"Then let's talk together."

"Night tour."

The two looked at each other and laughed again.

"We will travel at night in the future, even if there is no Disillusionment Charm, we don't have to worry about being caught by Filch."

"Yeah, it's great, there are many hidden passages that we haven't discovered yet."

"Try another password," Fred reminded, holding his wand against the map and whispering, "The prank is over."

The next moment, the traces on the parchment gradually disappeared, and within a few seconds it reverted to a blank old parchment.

"The traces have been wiped off!" George said in surprise. "The manufacturer thought so much."

"If everyone knew that there was such a thing, it would definitely be known to everyone." Fred thought for a while and said, "It should be to prevent the secret of the parchment from being seen by others."

"You said, did Filch find out how to use this parchment? He knows the locations of so many secret passages better than all the students." George raised his doubts, "and why did he put the parchment in the drawer? I would definitely take it with me if I could.”

"I don't know, it doesn't matter, anyway, the Marauder map belongs to us now, do you want to tell others." The others here in George were referring to Albert and Lee Jordan.

"No more." After thinking about it, Fred shook his head. "The less people know, the better."

"Don't forget, Albert knew about this." George suddenly said, "He must know what we took from Filch."

"But if we don't talk about it, he definitely doesn't know there is such a thing." Fred raised his eyebrows.

In fact, the two don't mind sharing the Marauder's map with others, but they are also worried that there will be a big mouth and they will lose this good thing.

"Don't think too much, let's go, let's go and see the other secret passages first." The twins looked at each other and walked away.

"What do you say the maker of this Marauder's Map: Moonface, Wormtail, Bigfoot, Prong?"

"I think they should be former Hogwarts students." George raised the head of the light statue and quickly opened a secret passage.

"Come on, someone is coming this way." Fred, who was staring at the map, reminded the wind.

After the two hurried into the secret passage, the statue was restored again.

"Where does this secret passage lead?" George let his wand glow, but unfortunately, his glowing spell has not been fully mastered, and it will suddenly go out after walking for a while.

"Fifth floor. Fred couldn't help but complain, "You haven't mastered the Lighting Spell yet! ""

"Say as if you've mastered it."