Mr. Penumbra's 24-Hour Bookstore

I recently read Sourdough, the latest book by this author, and loved it!! So I immediately started Mr. Penumbra. And then... This book completely lost me about half way through. I was digging the old quirky bookstore with the also quirky owner and strange visitors.. then the story started revealing what was actually going on with this bookstore and it's just way too outlandish for me. I found myself rolling my eyes several times and just had to put it down. I used to consider it a sin to not finish a book, but I figure you shouldn't waste your time on something you aren't actually enjoying. Life is too short.