Zia loved the old town library. It was a quiet place with tall shelves and dusty corners. One rainy afternoon, she noticed something strange. There were tiny footprints on the floor, but they stopped in the middle of nowhere. Zia looked around, but she saw no one. She felt curious and wanted to find out more. The footprints were small, like a child's, and they seemed to lead to a blank wall.
Zia decided to follow the footprints. She walked slowly and looked closely at the floor. The footprints went past the history section and turned left. Then they stopped right in front of a bookshelf. Zia pushed the bookshelf, but it did not move. She looked behind a row of books and found a small, embroidered bookmark. The bookmark had shiny thread and a picture of a key. It was a clue! Zia remembered that the library had a secret room. She had heard about it from the librarian. The librarian said, "Last week, I found a hidden door." Zia felt excited. She knew the answer was closer than she thought.