Hogwarts: The Savior's Strong Cousin

Parvati lowered her head, a hint of uneasiness in her voice. "I'll try my best, but you can't hurt Harry and the others. They are my friends."

"Your friend? Have you forgotten our mission?" The strange voice sneered. "If you fail to complete the mission, we will take more drastic measures."

Harry felt a chill in his heart, he knew that things were more complicated than he thought. He had to inform Hermione and Ron as soon as possible, but he also had to be careful not to let Parvati realize that he already knew her identity.

Quietly retreating back to the corridor, Harry walked quickly towards Gryffindor Tower. He knew that time was running out and he had to act quickly. His mind kept thinking about everything he had just heard, and his heart was filled with mixed emotions.

Back in the tower, Harry gently woke up Hermione and Ron. Although they were surprised and confused, they immediately sat up and listened carefully to Harry's report.

"We have to act," Harry whispered, his eyes gleaming with determination. "Parvati is undercover, but we can't let her know that we know all this."

Hermione frowned, clearly worried about this as well. "We need to come up with a plan that will protect the magical fruit while revealing Parvati's identity."

Ron nodded, a hint of nervousness in his tone. "We can't let her ruin our efforts, Harry. We have to tread carefully."

After some discussion, they decided to temporarily hide the magic fruit in a safe place and closely monitor Parvati's every move. At the same time, they also began to look for other possible clues, hoping to completely uncover the conspiracy of the black magic forces.

In the next few days, Harry, Hermione and Ron carefully carried out their plan. They secretly observed Parvati's every move, trying to find more evidence. At the same time, they also strengthened the protection of the magic fruit to ensure that it would not be discovered.

One night, when Harry was patrolling the edge of the Forbidden Forest, he suddenly felt a strong magical fluctuation. He immediately became alert, grasped his wand tightly, and slowly approached the source of the fluctuation.

When he got closer, he saw Parvati standing under a big tree, holding a crystal stone that was shining with black light in her hand. Her face was pale, and her eyes were full of struggle and pain.

"Parvati!" Harry shouted, trying to wake her up. "What are you doing?"

Parvati turned around suddenly, and a trace of panic flashed in her eyes when she saw Harry. The crystal in her hand suddenly burst into a strong black light, and the air around her seemed to be distorted.

"Harry, get out of here!" Parvati cried in pain, with despair in her voice. "I can't control it!"

Harry did not flinch, he knew he could not let Parvati be controlled by the dark magic. He quickly cast a protective spell, trying to resist the powerful force of the dark magic.

"Parvati, put down the crystal!" Harry said firmly, his eyes full of determination. "You can defeat it."

Parvati's hands trembled slightly, and her eyes flashed with pain and struggle. She gritted her teeth and tried to throw the crystal away, but the power of black magic seemed to be constantly devouring her will.

Harry concentrated all his magic power and strengthened the protective spell to the limit. He felt his strength being gradually drained away, but he did not retreat. He had only one belief in his heart - to save Parvati.

At this moment, Hermione and Ron arrived. When they saw Parvati's condition, they immediately cast a spell to help Harry resist the power of dark magic.

"We can't give up on her!" Hermione said loudly, her eyes full of determination. "Parvati, there is still hope!"

Ron also held his wand tightly, and cast a powerful magic light, gradually suppressing the power of the black magic. Parvati's complexion gradually recovered a little, and her hand finally relaxed. The crystal slipped from her hand and fell to the ground with a slight sound.

The black light gradually dissipated, and Parvati fell softly to the ground, her eyes filled with tears. "I'm sorry, Harry, I'm sorry..."

Harry walked over and gently helped Parvati up, his eyes full of understanding and relief. "Parvati, this is not your fault. We will face these difficulties together."

Parvati choked up and nodded, her eyes shining with gratitude and determination. She knew she had made a mistake, but she also knew that her friends had not given up on her.

Harry, Hermione and Ron brought Parvati back to Hogwarts and reported it to Professor McGonagall, who looked grim, but she also knew that Parvati did not betray them on purpose.

"We need to thoroughly investigate the origin of this crystal and the dark magic behind it," said Professor McGonagall, with determination in her eyes. "The safety of Hogwarts depends on each and every one of us."

Harry nodded, feeling a new hope in his heart. He knew that although the road ahead was still full of unknown dangers, they would not be alone. No matter what difficulties they encountered, they would face them together and fight together until the shadow of darkness was completely dispelled.

After Harry, Hermione, Ron and Parvati returned to Hogwarts, Professor McGonagall immediately convened an emergency meeting. Harry felt the tension in the atmosphere, and his heart was full of doubts and uneasiness. He knew that this crisis was far more serious than they had imagined.

In the headmaster's office, Professor McGonagall, Harry, Hermione and Ron sat around a long table, while Parvati stood aside, her eyes full of repentance and determination.

"Harry, we must find out who is hiding among us," Professor McGonagall said straight to the point. "We can't let the dark forces continue to erode Hogwarts."

Harry nodded, his heart filled with determination. "Professor, we need a plan, not only to catch the undercover, but also to ensure that they can no longer pose a threat to us."

Professor McGonagall nodded, with a glimmer of approval in her eyes. "Harry, you are right. We need a detailed plan. First, we need to identify all possible suspects and closely monitor their every move."

"We can use some magical tools, such as truth potions and memory-checking spells," Hermione suggested, her eyes full of thought. "These tools can help us confirm the suspect's motives and behavior."

Ron also nodded. "And we can set some traps to lead the undercover agents to reveal their true colors. For example, let them mistakenly believe that we have found the true location of the magic fruit."

Harry listened to his friends' suggestions and felt that his mind was gradually becoming clearer. He knew that they had to work together to successfully catch the undercover.