Mine is a bit odd in that it's actually a children's book.
When I was in elementary school, I was OBSESSED with John Bellairs'
A House With A Clock In Its Walls. It was a little creepy, had a short, fat kid as the hero (shades of myself) and was just so mysterious. The illustrations for the cover and for the few sprinkled throughout the book were done by Edward Gorey.
Cut to umpteen years later when I was the manager of a Waldenbooks. I had an out-of-print service track down an exact library copy of the one I used to check out in elementary school. It's now my prized possession. If the house was burning, it's probably the first thing I'd grab. And yes, I definitely reread it often.
Best,
Jay Hartman
Editor-In-Chief
Untreed Reads Publishing
http://www.untreedreads.com