*A fictional book*
I'm assuming this means what is your favorite fictional book? I'm reading The Historian by Elizabeth Kostova right now and it's really good. It's also a pretty large book, which makes me feel really smart carrying it around an having my bookmark stick out half way through. It's about Dracula...it sounds silly, but it's kinda creepy and keeps you on your toes (in a good way!). I haven't gotten to the end, but so far, I would recommend it!