Bibliophiles discussion

Years ago, I stumbled upon the "Shadow of the wind" trilogy by Carlos Ruiz Zafon in my local second-hand bookstore. I loved those books. I devoured them within days. Ever since, I've been craving books like that; books whose plot revolves around a musty, old bookshop and a mystery of any kind. If you have any recommendations, please suggest.
P.S. I've read "Mr. Penumbra's 24-hour bookstore" and it wasn't all that, but it's in the right direction....

I'll recommendSummer and August by K Spirito. I've never actually read it, but I know the author, and she based the setting on a real bookstore at the owner's request. Little did he guess that there'd be ghosts in his cellar! :)