It was late at night, and the lights in all parts of the castle were gradually extinguished. England ushered in a rare good weather, a night without heavy rain and dark clouds, the sky was full of stars shining on the earth, and Hogwarts was covered with a veil of mystery.

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

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 a few pots of warm-blooded vines next to the wall. This plant will continue to heat up .

In the wooden house, Hagrid came 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 the house.

The stars in the night sky became brighter, and the cool night wind blew through the entire castle. Beside the stone wall, a rooster with its head tucked into its neck may be a little cold, and it shakes its head.

In an instant, without any warning, a sharp wound appeared on its throat. The rooster wanted to flop twice before dying, but for some reason, it didn't even have the strength to lift its wings.

On the empty wooden roof, there was a slight fluctuation in the air.

In the chicken coop, 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 an invisible sharp knife was constantly cutting Open their throats.

Just as the prisoner attacked the next victim, something happened.

A faint light appeared on the nameplate that read "Wallup Breeding Farm presented Hogwarts School of Witchcraft and Wizardry", and the stimulating binding spell instantly enveloped the surrounding area.

The originally empty wooden roof, the transparent air twisted, and Professor Flitwick and Professor McGonagall immediately lifted off the invisibility cloak they were covering.

The two mighty wizards held out their wands, and from the tips of the wands spewed spells of manifestation and Patronus.

However, the manifestation spell did not work, and no silhouette appeared in the field.

The three silver cats belonging to Professor McGonagall rushed to the stone wall at once. The silver light on their bodies burst into flames, but nothing happened except to startle the chickens.

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

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

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

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

They adopted Sean's idea this time. After borrowing Harry's invisibility cloak, Professor Flitwick and Professor McGonagall, who were fit, hid in Newt's suitcase first, and then quietly went up to the wooden roof superior.

Among the chickens, Newt, who knew a little about alchemy, made a few temporary arrangements. He made a few 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 with each other. In order to prevent the heirs in the castle from seeing the flaws, Sean even forced them to find the trustworthy male and female student council presidents and drink compound soup to pretend to be the two of them, trying to deceive the heir behind the scenes.

But what the professors didn't expect was that the murderer would also be invisible, and he hadn't been trapped by the spells of the two.

Snape stepped forward with a gloomy expression. He grabbed a rooster that had just died and looked at it. He took out his wand and said a few more spells.

"The throat was simply cut by a sharp weapon, no poison 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. That guy who can be invisible is not easy to deal with, and our return without success this time also exposed our purpose." Professor McGonagall had a headache, "It should be fine tonight, let someone stay Stay with Hagrid."

The professors looked at each other, and everyone shivered after being blown by the cold night wind.

…

"Not caught?" In Professor McGonagall's office, Sean opened his mouth in surprise.

There should be nothing wrong with this plan of his own. Only a few people know about Harry's invisibility cloak. He even used Polyjuice Potion to prevent possible ghosts in the castle—you know, Snape I'm not happy when it comes to offering these things.

Professor McGonagall nodded, and then told Sean everything about last night.

After listening, Sean rested his chin with his hand.

The other party still made a move, which means that there is no ghost in the castle, or that ghosts do not exist at the professor level. Invisible enemies, but revealing spells and such don't work?

Sean couldn't understand it. The world of magic is amazing, but he has never heard of creatures that are not affected by magic spells. The trigger binding spell should be able to hit it...

Unless the opponent's speed is ridiculously fast... But it can't be a wizard, and there is no such invisible, extremely fast creature among Fantastic Beasts...

How can there be creatures that are not affected by the spell... Sean frowned forcefully.

Professor McGonagall didn't disturb his thinking. Although Sean's plan didn't work out, in her eyes, the little wizard had already proved his intelligence.

And he really looks like Albus when he thinks... The eyes under Professor McGonagall's glasses flickered.

On the other side ~lightnovelpub.net~ Sean, who is puzzled, has put his suspicion on some kind of mysterious power. He even wonders if a certain crime has been revived in advance, otherwise, the magic The spell doesn't take effect, how can this be explained, the other party is not a ghost...

etc! Sean's eyes widened suddenly.

Ghost, yeah, how did I forget that guy?

Professor McGonagall, who saw the change in his expression, asked softly, "Sean, did you find anything?"

Sean raised his head: "Professor, can ghosts be affected by spells?"

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

Suddenly, Professor McGonagall's eyes widened.

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