Today on Reddit, someone linked me to a series of short stories on Nosleep, a subreddit for posting short horror stories. The first story was called "Footsteps". Since it got such good reviews I decided to give it a shot.
Before I knew it, I had read through the series and was sad it was over. It was shocking, terrifying, and depressing. The author has expanded it into a novel I plan on buying soon.
http://www.reddit.com/r/nosleep/comments/k8ktr/footsteps/Here it is! Only start reading if you have about two hours free.