Blue paperback mystery novel with coffee stain

I lost my blue paperback mystery novel, The Night Train, yesterday around 5pm near the Grand Island Public Library on West 2nd Street. It's a paperback with a blue cover, a coffee stain along the bottom edge, and a green ribbon bookmark sticking out from chapter 7. The spine is creased, and there's a handwritten note 'for Emma' on the first page. It has sentimental value because it was a gift from my aunt, who loved mystery novels. If you found it, I'd really appreciate getting it back.