Blue hardcover Penguin Classics edition, worn spine

I lost my blue hardcover Penguin Classics edition of a novel yesterday around 3pm. I had it with me while browsing the poetry shelf at Moravian Book Shop on Main Street in Bethlehem, Lehigh Valley, near the café. The book is in decent shape, with gold lettering on the spine and a faint coffee ring on the back cover; there’s a green bookmark with a pressed fern sticking out from page 112. It really matters to me because it was a gift from my aunt, and I’d be incredibly grateful to have it returned.