It's been years since a chemical plant accident killed 138 employees including Jacob's father, a fact that has made Jacob obsessed with the plant ever since. Jacob's friends lure him to the plant to play a prank on him in hopes that he will come to his senses and realize the plant is not haunted. When Jacob discovers that he has been duped, he snaps, picks up an ax and goes on a rage filled killing spree. His friends and everyone else in the building have to hide and fight for their lives from this disturbed ax wielding maniac.
