The school year had just begun at Oakwood Academy. The morning sun was shining brightly, illuminating the school's grand architecture. Suddenly, the peaceful ambiance was shattered by an alarming news.

Their favorite teacher, Mr. Arthur, had vanished inexplicably. The students were shocked and saddened. Mr. Arthur was not just a teacher; he was a mentor, a friend.

Among the students, four friends decided not to sit idle. They were Carl, Susan, Peter, and Emma, also known as the "Inquiry Squad". They were determined to solve this mystery.

They began their investigation in Mr. Arthur's classroom. It was a room filled with history and knowledge, every corner echoing their missing mentor's wisdom.

Susan noticed a peculiar book lying on Mr. Arthur's desk. It was an old, dusty book with a lock, a diary perhaps. Susan's eyes gleamed with curiosity.

Carl, the group's de facto leader, decided they should take the book. They could use it as a clue. With the book in their possession, the Inquiry Squad left the classroom.

They gathered in their secret hideout, an abandoned treehouse near the school. Here, they would examine the mysterious book, hoping it would reveal something about Mr. Arthur's disappearance.

Emma was the first to notice something odd about the book. It wasn't a diary. It was a book on ancient spells. The friends exchanged puzzled glances.

Peter, the athletic and bold one, suggested they try one of the spells. The others agreed, albeit with some hesitation. They had no idea what they were getting into.

As they recited the spell aloud, a bright light engulfed the treehouse. When the light faded, they found themselves in an entirely different place.

They were standing in a grand hall, filled with countless books and scrolls. It was an extraordinary sight. The friends realized they had somehow traveled to a different realm.

In the distance, they saw a figure. As they approached, they realized it was Mr. Arthur! Relief washed over them. They had found their beloved teacher.

Mr. Arthur explained that he had accidentally activated a teleportation spell, which had brought him to this realm. He was trapped, unable to return to the school.

The friends decided to help Mr. Arthur. They would have to find the reversal spell to return to their school. Their adventure was far from over.

They spent days exploring the grand hall, reading ancient texts, and deciphering cryptic scrolls. It was a task of immense patience and determination.

Finally, after countless trials and errors, they found the reversal spell. They were ready to bring Mr. Arthur back to the school, back to Oakwood Academy.

With bated breath, they recited the spell. A brilliant light enveloped them, and when it faded, they were back in the treehouse. Along with them was Mr. Arthur.

The joy of reunion was indescribable. Mr. Arthur thanked the Inquiry Squad for their bravery and determination. The school was once again complete.

Word of their adventure spread throughout the school. The Inquiry Squad became the heroes of Oakwood Academy. They had solved the mystery and brought back their beloved teacher.

The school year continued, and life at Oakwood Academy returned to normal. But the Inquiry Squad knew better. Every corner of the school held a potential adventure, a potential mystery.

And so, the Inquiry Squad continued their exploits, always ready for another mystery. As for Mr. Arthur, he ensured to be extra careful with his spellbook.

Oakwood Academy remained a school with a difference, a school that transformed into a place of mystery and adventure, thanks to the Inquiry Squad.

And thus, the tale of 'The Vanishing Spell' became a legendary story told and retold at Oakwood Academy. A tale of courage, friendship, and the power of determination.

Every student at Oakwood Academy knew the story of the Inquiry Squad and their beloved Mr. Arthur. The legacy of their adventure lived on, inspiring generations.

In the end, Oakwood Academy was not just a school. It was a place where every day could turn into an adventure, a mystery to unravel, a tale to tell.