Emma loved visiting the old library near her school. It was a quiet place full of dusty books, enormous wooden shelves, and paintings of famous writers. Every Thursday afternoon, she went there to read adventure stories while her brother attended his music class.

One rainy day, while Emma was searching for a new book, she noticed something unusual: a small blue notebook hidden behind a row of thick encyclopedias. Its cover was scratched, and the pages were yellow, as if it had been forgotten for many years.

Curious, Emma opened it. Inside, she found strange notes written in different handwriting styles. Some pages had drawings of keys, maps, and even a mysterious door. Others contained short messages like “Don’t forget the last clue!” and “The answer is under the light.”

Emma felt excited. Was someone trying to solve a puzzle? Or had someone left the notebook there on purpose? She decided to investigate.

She followed the clues written inside. Slowly, she walked around the library, searching near lamps, under tables, and behind the long curtains. Finally, behind a tall bookshelf, she discovered a tiny wooden box with a golden symbol carved on the top. Emma took a deep breath and opened it…

Inside, she found… another note that said: “If you found this, the adventure has just begun.”