When a young girl suffers years of horrendous sexual abuse from her monster of a father, she finally breaks spawning a cold, hateful and manipulative teenager, that will stop at nothing, to get her own way - including murder.

After a prank goes wrong, one person is left dead and another institutionalized. Ten years later, a group of friends are partying at a cabin in the woods unaware that a deranged psychiatric patient has escaped and is hell bent on revenge.

A psychology instructor and her senior class investigate a string of unsolved murders targeting staff and students at their high school over two years, trying to identify the masked killer.