Private Eyes For Hire was a detective agency that was formed by Greg and his friend Rowley in The Third Wheel. Nobody hired them, so they went around checking on their own. They mainly spied near Mr. Millis's house since he had all the movie channels on his TV. Then one day, Greg told Rowley to confront Scotty Douglas as Scotty borrowed a video game from Greg and didn't give it back. Greg caught Rowley playing the game with Scotty Douglas, so he fired Rowley from the agency and had to close it up. They made it after a police officer from the NARC came to the school and told them about it, which inspired Greg to make a detective agency.
- Diary of a Wimpy Kid: The Third Wheel (First and only appearance)