Afraid (The Konrath Dark Thriller Collective Book 3) by J.A. Konrath is a four star read of relentless horror.
I received a complimentary copy from Amazon. That did not change my opinion for this review.
"Nestled in the woods of Wisconsin, Safe Haven is miles from everything. With one road in and out, this is a town so peaceful it has never needed a full-time police force. Until now...A helicopter has crashed on the outskirts of town and something terrible has been unleashed. A classified secret weapon programmed to kill anything that stands in its way."
Link to purchase: http://www.amazon.com/gp/product/B009KA18NO