Blue hardcover mystery novel with red bookmark

I lost my blue hardcover mystery novel yesterday around 3pm near the Starbucks on Main Street in Annapolis. It's a 320-page hardcover with gold lettering on the spine and a stormy-sea and lighthouse cover. Inside, there's a red ribbon bookmark and a tiny pressed lavender sprig tucked between pages 110–115. This book is a gift from my grandmother and holds sentimental value, so I really need it back. If anyone found it, please message me—I'd be endlessly grateful.