Blue hardcover mystery novel with red bookmark

I lost my blue hardcover mystery novel yesterday around 3pm outside the Barnes & Noble at WestShore Plaza in Tampa. It's a first edition from St. Martin's Press, with a gold embossed title on the spine and a red ribbon bookmark sticking out. The cover is worn, there's a coffee stain on the bottom corner and a pencil initials 'A.K.' inside the front cover, plus a coffee ring on page 120. It was a gift from my grandmother and really helped me through a rough patch, so it's sentimental. If anyone found it, I'd really appreciate getting it back.