That night, Harry tossed and turned in bed, listening to the snoring of his roommates, and couldn't fall asleep.

He was still thinking about what happened during the day. Whether it was the big win over Slytherin or seeing his archenemy Draco Malfoy being scolded by his father, he was very happy.

But he suddenly felt lonely, and he also wanted to taste the feeling of being scolded by his parents.

Everyone was looking forward to the arrival of summer vacation, but he was the only one who resisted. He even planned to stay with Hagrid, or go to the Burrow.

"Harry~ Potter!"

A barely audible call sounded. Harry was not unfamiliar with this voice. He hurriedly put on his glasses and looked at the thin figure standing at the door.

He had a pair of huge brown eyes and a nose that was shaped and sized like a big tomato.

"Dobby, Dobby, it's really you!"

Harry quickly looked around. They were sleeping soundly, and even Ron's pet gray fat rat Scabbers was sleeping comfortably on its owner's pillow.

He gently lifted the quilt, climbed out of the bed, looked at the wand on the bedside, hesitated for a moment, and took it in his hand.

"Lumos."

Harry took Dobby to the common room, where there was only a faint light, and he chose a cushioned chair to sit down.

"Please sit down, Dobby, you have something to tell me, right?"

When he got closer, he found that Dobby had changed his clothes. No, he didn't change, it was still the same old pillowcase, but he didn't know where the elf found it, and added two sleeves and something that looked like trouser legs.

"It's wrong for you to change into new clothes! Dobby, you, you..." He pointed at Dobby and couldn't speak. He learned from Ron that house elves could not wear normal people's clothes. There was only one possibility,

"Yes, Mr. Potter, Dobby, Dobby is free!" The elf's big eyes were filled with tears, and he screamed with joy.

"How could that be? I mean, congratulations, Dobby." Harry said, "But you followed Lucius Malfoy during the day?"

"Dobby doesn't know either. Maybe the failure of the young master during the day made him feel bad. When he went back at night, he scolded Dobby severely... Dobby has gotten used to it, but I didn't expect that he would drive Dobby away!"

Harry opened his mouth to say something, but Dobby continued to speak freely: "Never thought about it... This is what Dobby has always dreamed of..."

Dobby loosened his fingers, and a gorgeous button lay quietly on his slender palm.

"Master, no, Lucius Malfoy gave Dobby a button, which he tore off from his body... He angrily asked Dobby to leave Malfoy Manor forever."

"So you are free and don't belong to anyone?" Harry said.

"Yes, Dobby is a free elf now." Dobby blinked his big eyes, "All this is thanks to you, the great Harry Potter, for defeating Draco Malfoy on the court!"

Harry felt that things are impermanent, and his victory over Slytherin could have such a huge impact on Dobby.

"I didn't expect it either. Of course, I feel honored." Harry said modestly, "By the way, Dobby, you shouldn't be bound by your status now, right? I have a lot of questions to ask you."

"Just speak up, Dobby will do his best."

"It's like this, was the Chamber of Secrets a conspiracy by Lucius Malfoy?" Harry asked the doubts that the three of them had discussed during the day.

"Yes, he brought the Dark Lord's relic: a cursed diary to Hogwarts with the help of Ginny Weasley."

"Wait! Ginny?"

"...Yes, in Flourish and Blotts."

A flash of inspiration awakened Harry, and he said in an affirmative tone: "He had a fight with Mr. Weasley at the time. I remember that he picked up Ginny's textbook in the end and laughed at her severely! Lucius must have secretly stuffed the diary in it, right?"

"Absolutely correct, Mr. Potter." Dobby said, bending over.

"Then you stopped me from returning to school and attacked me on the court because of that relic. It was it that opened the Chamber of Secrets?"

Dobby lowered his head and whispered, "You are right. Dobby overheard Malfoy's words. Mr. Potter, you don't know how dark the days of house-elves were during the reign of the Dark Lord. Now it is actually much better than before..."

It was difficult for Harry to imagine what kind of life the house-elves lived at that time.

He comforted him and said, "You have finally gotten what you deserved, haven't you?" But Harry suddenly thought of something and almost jumped up. He said in a trembling voice, "Then now, is the diary still in Ginny's hands?"

"Will she be in danger?"

Dobby whispered, "No, the diary has been in the hands of three people. It was first Miss Weasley, and then I don't know how it got to Draco Malfoy, and finally, it fell into the hands of the equally great Mr. Felix Hepp."

"Professor Hepp?" Potter was stunned.

"Yes, but Mr. Heppe realized the evil of the diary, and he destroyed it, completely destroyed it! Right in front of Dobby..."

Harry felt that his brain was not enough. The explosive news tonight made him overwhelmed, and he had a blank expression on his face.

...

The next morning.

"You mean, the source of all this is Lucius Malfoy? He hid the diary in Ginny's textbook, and Ginny was controlled to open the Chamber of Secrets, releasing the basilisk and causing Mrs. Norris and Creevey to be petrified! Then the diary fell into Malfoy's hands. Oh my God, he really deserved it! But the most outrageous thing is that the diary is now destroyed by Professor Heppe!"

Ron had never said so many words in one breath. He took a few big gulps of pumpkin juice.

"That's it." Harry nodded, and he suddenly told the story of how he accidentally ran into Draco when he was rescuing Justin. "He looked confused, but I didn't have time to think about it. So many things happened afterwards that I completely forgot about it."

"Oh my God, Professor Hep didn't leak a single word!" Ron said, not sure whether he was complaining or admiring.

Hermione fell into memories, and she added, "Do you remember the time I was in the hospital? Professor Hep warned me that the danger was over and asked us not to investigate further. I think he got the diary at that time, and maybe he had destroyed it."

"Besides," the little witch counted on her fingers, "Professor Hepple must have told Dumbledore, and Dumbledore might have told your parents, Ron." At this point, she said a little frustrated, "Although, he didn't tell us."

"Cool~ It turns out that the adults did so many things behind our backs." Ron said.

"So what is Dobby planning now?" Hermione asked.

"I don't know yet. I guess he might go visit a friend?" Harry said uncertainly.

Ron hurriedly finished his breakfast and left in a hurry.

"Where are you going, Ron?"

"I'm going to ask Ginny. It suddenly occurred to me, what if the diary has any effect on her?"

"You're right!"

...

As Ginny stuttered in her description, they learned more information.

"You threw the diary in the abandoned bathroom?" Harry stared into Ginny's eyes and asked in surprise.

Ginny lowered her head shyly, with a bright blush on her face: "Yes, Fred and George told me a lot of scary examples at that time, and I realized something was wrong."

"It's exactly right! Malfoy followed us, but we urgently moved the potion away. He found nothing, but found the diary." Harry said.

He couldn't help but break out in a cold sweat. The vague shadow he saw at that time should be the diary that Ginny threw away, but because he found Malfoy, he didn't have time to take a closer look. If

he picked up the diary and controlled him, and he was caught on the way to open the Chamber of Secrets, he would really have no way to defend himself. You know, at that time he was misunderstood by everyone because of his Parseltongue.

"Ginny, are you feeling unwell?" Ron asked.

Ginny shook her head. "I followed Luna's advice and went to the school hospital. Apart from being a little weak, there was no other problem. Madam Pomfrey gave me two bottles of potion and I recovered quickly."

"By the way, she also said that a boy had similar symptoms..."

The three looked at each other and said in unison: "Draco Malfoy!"

They spent half a Sunday and barely pieced together the complete truth

. From Lucius's revenge, to Ginny being controlled to open the Chamber of Secrets and causing two attacks, she threw away the diary after discovering the abnormality, but it was picked up by Draco Malfoy again. Draco was caught by Harry when he opened the Chamber of Secrets and saved Justin. Then they went deep into the Chamber of Secrets to kill the basilisk. After that, the diary fell into the hands of Professor Hepp and was completely destroyed, and the Chamber of Secrets incident came to an end.

"It's strange. Professor Hepp's presence in the whole thing is too strong."

"This shows that he really found out the whole truth."

Harry, Ron and Hermione sat lazily by the Black Lake, feeling a sense of satisfaction in solving a mystery that had been lingering in their hearts for a long time.

They also put down a huge stone in their hearts and prepared for the exam.

January passed quickly, and the rainy season came with the exam season.