As the night progressed, the lights throughout the castle gradually went out. England ushered in a rare occasion of good weather. It was a night without heavy rain or dark clouds. The stars in the sky illuminated the earth, casting a mysterious veil over Hogwarts.

In the open space near the playground, the professors temporarily built a simple open-air chicken pen, and Hagrid lived in a small wooden house next to it. To ensure his personal safety, there were no secret passages to water pipes nearby. And if the basilisk swaggers across the ground, the defensive spell arranged by Professor Flitwick will be activated instantly.

The rooster army provided by the generous Mr. Wallop is currently sleeping huddled against the wall. Although it is an open-air environment, Professor Sprout has placed several pots of warm-blooded vines beside the wall. This plant will continuously generate heat. .

In the wooden house, Hagrid walked out with a lantern. He stretched his neck and looked into the chicken coop surrounded by stone walls. After confirming that there was nothing abnormal, he walked back into the warm room.

Not long after, Hagrid's muffled snoring came from inside the house.

The stars in the night sky became brighter, and the cool night breeze blew through the entire castle. Beside the stone wall, there was a rooster with its head tucked into its neck. Perhaps it was a little cold, and it shook its head.

In an instant, without any warning, a sharp wound appeared in its throat. The rooster wanted to flutter twice before dying, but for some reason, it did not even have the strength to lift its wings.

There was a slight fluctuation in the air on the empty wooden roof.

In the chicken pen, with the fall of the first victim (the victim chicken), it was like a chain reaction. The sleeping roosters fell one after another, as if there was an invisible sharp blade that was constantly cutting. Open their throats.

Just as the prisoner was about to attack the next victim, something happened.

The nameplate that read "Wallup Breeding Farm Presented to Hogwarts School of Witchcraft and Wizardry" glowed with a faint light, and an stimulating binding spell instantly enveloped the surrounding area.

The transparent air on the originally empty wooden roof began to twist, and Professor Flitwick and Professor McGonagall immediately lifted off the invisibility cloaks covering their bodies.

The two powerful wizards stretched out their wands, and the Appearance Charm and the Patronus Charm spurted out from the tips of the wands.

However, the Revealing Spell did not work, and no outline appeared in the field.

The three silver cats belonging to Professor McGonagall suddenly rushed to the stone wall. The silver light on their bodies shone brightly, but apart from disturbing the chickens, nothing happened.

"Invisibility cloak?" Professor Flitwick frowned, then waved his wand, and the wind surged. However, apart from chicken feathers blowing all over the ground, I saw nothing.

At the gate of the castle, several other professors who had been hiding quickly rushed to the scene.

"No one caught, Minerva?" Professor Sprout asked.

"Run away..." Professor McGonagall's face looked a little ugly.

They adopted Sean's idea this time. After borrowing Harry's invisibility cloak, Professors Flitwick and McGonagall, who were of suitable size, first hid in Newt's suitcase, and then quietly climbed to the wooden roof. superior.

Among the chickens, Newt, who had a little knowledge of alchemy, made a few temporary arrangements. He made several nameplates into temporary magic props. As long as the rooster wearing the nameplate was attacked, the binding spell on it would will start by itself.

In the plan, when the binding spell is activated, Professor McGonagall and Professor Flitwick will immediately cooperate to take action. In order to prevent the heir in the castle from seeing the flaw, Sean even asked a trusted male and female student council president to drink polyjuice potion and pretend to be the two of them, hoping to deceive the heir behind the scenes.

But what the professors didn't expect was that the murderer would become invisible and not trapped by the two's spell.

Snape stepped forward with a gloomy look on his face. He grabbed a recently dead rooster and looked at it, then took out his wand and recited a few spells.

"The throat was simply cut with a sharp weapon. There was no poisoning or black magic." He said coldly.

Everyone else looked at Professor McGonagall, waiting for her to make a decision.

"We need to think of other ways. The invisible guy is difficult to deal with, and our failure to return this time has exposed our purpose." Professor McGonagall had a headache. "It should be fine tonight. Leave one person behind." Stay with Hagrid."

The professors looked at each other, and all of them shivered when the cold night wind blew on the backs of their necks.

"Didn't catch it?" In Professor McGonagall's office, Sean opened his mouth in surprise.

There shouldn't be anything wrong with his plan. Only a few people knew about Harry's invisibility cloak. In order to prevent possible moles in the castle, he even used Polyjuice Potion - you know, Snake Pu was always unhappy when he provided these things.

Professor McGonagall nodded and told Sean everything about last night.

After listening, Sean rested his chin on his hand.

The other party still took action, which meant that there was no mole in the castle, or in other words, the mole did not exist at the professor level. Invisible enemies, but revealing spells etc. don't work?

Sean couldn't understand. The world of magic was magical, but he had never heard of a creature that was not affected by magic spells. The triggering binding spell should be able to hit...

Unless the opponent is incredibly fast... But it cannot be a wizard, and there are no such invisible and extremely fast creatures among magical animals...

How can there be any creature that is not affected by the curse... Sean's brows frowned hard.

Professor McGonagall did not interrupt his thinking. Although Sean's plan did not succeed, in her eyes, the little wizard had proven his intelligence.

And he looked so much like Albus when he was thinking... Professor McGonagall's eyes flashed under her glasses.

On the other side, Sean, who was puzzled, had placed his suspicion on some mysterious power. He even wondered whether a certain guilty party had been resurrected in advance. Otherwise, the spell would not take effect. How could this happen? Explanation, the other party is not a ghost...

etc! Sean's eyes suddenly widened.

Ghost, yes, how could I forget that guy?

Seeing the change in his expression, Professor McGonagall asked softly: "Sean, did you discover anything?"

Sean raised his head: "Professor, will ghosts be affected by the spell?"

"Ghost? Of course not," Professor McGonagall was a little confused. "You suspect that the murderer is a ghost? But ghosts cannot be invisible, and they can only have a very small impact on the real world, such as splashing a little water or something. ——Severing the neck of a creature is not something a ghost can do...Wait a minute!"

Suddenly, Professor McGonagall's eyes widened.

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