Red paperback mystery novel with a note inside

I lost my red paperback mystery novel yesterday around 3pm, probably near the Billings Public Library on Broadway. It's a softcover, about 320 pages, with a creased spine and a black embossed title. Inside there's a small yellow sticky note with a quote in cursive tucked between pages 142 and 143. I also left a blue ribbon bookmark peeking out. It has sentimental value—it was a gift from my grandmother, and I’d really like it back.