Hogwarts: The Savior's Strong Cousin

Harry felt a sense of powerlessness and anger, but he knew that the most important thing now was to find a solution. He whispered, "Parvati, we will help you, but you must tell us everything."

Parvati nodded and began to tell her story and Cyrus Knox's plan in detail. Harry and his friends finally understood Cyrus's true intentions and knew that the moment of decisive battle was approaching.

Since Parvati admitted that she was an undercover agent forced by Cyrus Knox, Harry's mixed emotions were hard to calm down. Although he understood Parvati's situation, it also made him realize that Cyrus's conspiracy was far more complicated and dangerous than he thought. He decided to cooperate with Professor McGonagall to find out Cyrus' other undercover agents in Hogwarts.

One morning, Harry came to the headmaster's office and knocked on the door with a heavy heart. Professor McGonagall's voice came: "Come in."

Harry opened the door and saw Professor McGonagall sitting behind her desk with a serious look on her face. Harry walked up to her and said, "Professor, I need to talk to you about Cyrus Knox."

Professor McGonagall nodded and motioned for him to sit down. "Harry, I have been following your actions. Have you found anything new?"

Harry took a deep breath and began to tell the details of Parvati and what she had revealed about Cyrus's plan. Professor McGonagall listened very carefully, with a thoughtful gleam in her eyes.

"It seems that things are more complicated than we thought," Professor McGonagall said after thinking for a moment, "We must find Cyrus's other undercover agents in Hogwarts to prevent them from causing further damage."

Harry nodded: "Professor, I think we need a careful plan to catch all these undercover agents in one fell swoop."

Professor McGonagall smiled and said, "What do you think, Harry?"

After a brief thought, Harry said, "We can design a trap to lure them out. Parvati can pretend to continue working for Cyrus and pass on some false information to lure out other undercover agents."

Professor McGonagall nodded in agreement, "That's a good idea, but we need to be very careful to make sure our plan goes undetected."

In the next few days, Harry and Professor McGonagall secretly made a detailed plan. They arranged for Parvati to inadvertently reveal some information about Harry and other students' actions when delivering messages, thus attracting the attention of Cyrus' undercover.

One night, Harry, Hermione and Ron secretly met in the library to discuss the details of the plan. Hermione carefully flipped through an ancient magic book and whispered, "We need to set up a powerful protective spell to ensure that once the undercover shows up, they can't escape."

Ron nodded, "Yes, we also need some strong binding spells to prevent them from using magic to escape."

Harry was silent for a moment, then said firmly: "This operation is very dangerous, but we must succeed. Cyrus's conspiracy must be stopped."

Finally, they decided to carry out the operation late at night. That night, Harry and his friends set a trap in the restricted area and arranged for Parvati to meet with other undercover agents there.

As night fell, the library was silent. Harry, Hermione and Ron hid in the dark, waiting nervously. Time passed by, and finally, a figure quietly appeared at the door of the library.

It was Draco Malfoy, who walked cautiously into the restricted section, looked around, and whispered, "Parvati?"

Parvati stepped out of the shadows and whispered, "Draco, I have important news for you."

Draco looked a little hesitant, but still approached Parvati. At this moment, Harry suddenly rushed out from the darkness and raised his wand: "Now!"

Hermione and Ron simultaneously launched a protective spell and a binding spell, and the entire restricted area was instantly covered by a powerful magical barrier. Draco was startled by the sudden change, but he reacted quickly and tried to break free.

"You idiots!" Draco shouted angrily, "You think you can catch me like this?"

Harry responded calmly, "Draco, you have reached the point of no return. Tell us what Cyrus is planning."

Draco's face turned gloomy, but he obviously knew that he had no way to escape. After a fierce confrontation, Draco finally whispered: "Okay, I'll tell you. Cyrus plans to launch a large-scale attack on Hogwarts, and he has arranged many insiders."

Harry's heart tightened: "When?"

Draco replied coldly: "On the night of the next full moon, he will use a dark magic circle to guide the dark forces to attack Hogwarts."

Hermione quickly recorded this information, and then said to Harry: "We must tell Professor McGonagall about this news immediately and strengthen the protection."

Harry nodded and looked at Draco with mixed emotions. He had been their enemy, but now he was providing information that could save Hogwarts.

Back in the headmaster's office, Harry and his friends told Professor McGonagall the details of what Draco had provided. Professor McGonagall looked serious and quickly issued a series of instructions to strengthen the defense of Hogwarts, and secretly notified all professors and senior students to prepare for the upcoming attack.

Harry, Hermione and Ron were not idle either. They used every bit of their time to continue studying and practicing new defensive spells, and setting up fortifications with other classmates.

Time passed quickly, and soon it was the night of the full moon. That night, the whole Hogwarts was on high alert, and everyone was nervously waiting for the upcoming battle.

Late at night, a cold wind blew through the campus, and the air was filled with an ominous atmosphere. Harry stood on the tower of the castle, holding his wand tightly, his heart full of determination. He knew that this would be a difficult battle, but he and his friends were ready to meet the upcoming challenge.

Suddenly, there was a low roar in the distance, and then a dark force surged from the horizon and headed straight for Hogwarts. Harry took a deep breath, raised his wand, and prepared to fight.

"For Hogwarts!" Harry shouted, his voice full of determination and courage.

A few days have passed since the battle on the full moon night. Although Harry, Hermione and Ron feel tired, they know that they can't relax. The threat of Cyrus Knox still exists. Life at Hogwarts gradually returns to normal, but Harry always has an uneasy premonition in his heart.

One night, Harry was discussing recent magic practice with Hermione and Ron in the Gryffindor common room. Suddenly, an owl flew in and brought a letter. Harry opened the envelope and saw a handwritten letter from Professor McGonagall: "Harry, please go to your dormitory immediately. It's an emergency."