"You're looking for the stolen PDF," he said, his eyes twinkling oddly.
"It turned into a digital parrot and flew into the library's old network," Mr. Higgins whispered. "It repeats random vocabulary words. To get the PDF back, you have to catch the parrot by saying the correct command."
Mr. Higgins sighed. "The PDF isn't stolen. It's hidden . Three years ago, a naughty 5th grader named Jake tried to download it so he wouldn't have to carry the heavy book. But he made a mistake. He spilled his soda on the server. The PDF didn't disappear. It… escaped."
Suddenly, a shadow loomed behind them.
They spun around. It was Mr. Higgins, the school librarian—the one who had retired years ago. But he wasn't a ghost. He was very real, very old, and very angry.