Sheep Skin (2013)

A woman working at a biological research facility becomes ill when she contracts a deadly, new virus. Sometime after, she becomes a half-monster beast and kills her old co-workers. Some time later, a group of teens go into the old research facility to have a party and come face-to-face with creature

How many times has this happened to you? Your mother goes out of town for a few weeks and you agree to take in her mail. You ride your bike over to her house and on the way you stop at a yardsale where an old man sells you a strange-looking gold box for seventeen dollars. Of course! It's happened to all of us how many times? It seems like every other movie begins the same way. But wait! Just as the movie seems to be mired in the mundane, it goes totally nuts!

Odessa and Kyle James were just your average American boys until the night they went upstairs and killed their parents in cold blood... and smiled.

A weekend retreat at a remote cabin in the woods for a group of childhood pals turns into a terrifying fight for survival, as a former friend whose family was killed years earlier comes along looking for revenge.