The Map Trap by Andrew Clements (author) (US edition)

Mystery. Intrigue. Clues. Detention. Maps, crime and trouble at middle school. What’s the next best thing to being a spy? Being a mapping genius. Alton Barnes loves maps, and not just for the geography. Because maps can show you more than just places. You get regular location maps, sure. But Alton likes to draw maps that explain a whole lot more. Like what he really thinks of his friends. And teachers. Even the principal. So when Alton’s maps are stolen from his locker, there’s serious trouble on the horizon. He’ll need some mad cartographic skills to find the culprit and get his maps back… Thrilling stuff with amazing illustrations all the way through.