Red hardcover mystery novel with coffee ring

I found a red hardcover mystery novel this afternoon around 2:15pm in the parking lot behind the Chillicothe Public Library on West Main Street. It's an older edition of Agatha Christie’s The Mysterious Affair at Styles, with a coffee ring on the back cover and a small sticker on the spine. Inside the dust jacket there’s a pressed forget-me-not and a faded bookmark with 'Grandview Middle School' written in blue ink. I figured someone might be missing it, so I left it at the library's lost-and-found desk, but if this is yours, send me a note and we can arrange pickup at the desk.