Those Across the River by Christopher Buehlman. Wow. I still can't get this one out of my head. Set a few years after WWI, failed academic Frank Nichols and his wife arrive in a small town in Georgia, which has some serious secrets. A reviewer called it "As much F. Scott Fitzgerald as Dean Koontz."
Another one I highly recommend is The Night Circus by Erin Morgenstern. "The circus arrives with no warning. No announcements precede it, no paper notices plastered on lamposts and billboards. It is simply there, when yesterday it was not..."
Miss Peregrine's Home for Peculiar Children was another I thoroughly enjoyed. A mysterious island, an abandoned orphanage, a strange collection of odd photographs...
And my last recommendation:
In the summer before Cullen Witter's senior year, a birdwatcher in the small Arkansas town claims to have seem a bird declared extinct in the 1940's. Amid all the hubbub, Cullen's beloved younger brother disappears.
It was hard to narrow all my summer reads down to just this list, but they are terrific and I think you'll enjoy them as much as I did.