Lost & found printed media in The Thumb

Blue Penguin Classics paperback found near Book Nook

I found a well-loved blue paperback this afternoon around 2:45pm near the Book Nook on Main Street in downtown The Thumb. It's a Penguin Classics edition of a mystery novel, with a creased spine, dog-eared corners, and a coffee stain on the back cover. Inside, there's a red ribbon bookmark peeking out at pages 142-143, and a faint pencil note in the margin that says 'Clue: the old lighthouse'. If this belongs to you, I'd really like to help get it back - I know how much a favorite book can mean, especially when it was a gift or a memory.