Blue paperback mystery with fox bookmark found

I found a blue paperback mystery novel this afternoon around 3:15pm behind the Portales Public Library on Main Street. The cover is a little scuffed, with a creased spine and a dog-eared page near chapter 7, and there’s a small fox-shaped bookmark tucked between the pages. Inside the first page I spotted a red sticker that reads 'Book Club 4'—a small clue that might help identify the owner. I’m posting here because someone else might be missing their weekend read; I’d love to help get it back to its reader and I hope the owner sees this.