Jackson, a curious fifth-grader, loved solving puzzles and mysteries. One day, as he walked through the school hallway, he noticed his best friend, Liam, frantically searching for something.

"Hey, Liam, what's wrong?" Jackson asked, concerned.

"My backpack is missing! I had it with me when I went to the library, but now it's gone," Liam replied, his voice shaking with worry.