Sarah Bell is a young twenty something with a sharp attitude, spending her Friday night with a group of friends in the middle of the notorious Northwood forest. Sarah quickly becomes a victim in a twisted hunt by a pack of insane individuals all being manipulated by something much more sinister. Now cut off from her friends and any signs of civilization, Sarah must fight for her life in order to survive the night, all the while trying to keep a grip on her sanity. However, Sarah will shortly discover that Madness is contagious.