Kerry Johnson's spirit as been broken by the ordeals of living in a twisted broken home. Her science teacher, Mr. Hill, convinces her that the best escape from her nightmare is to join the annual field trip. But none of her domestic nightmares can compare to what she and her classmates will experience when they penetrate the deepest layer of the forest. Out of the darkness comes something so terrifying and bloodthirsty that neither Mr. Hill's hi-tech electronic gadgets nor the county sheriff could ever hope to save them. The unseen presence hunts the teenagers relentlessly and ruthlessly, forcing Kerry and her friends to summon every ounce of courage they possess to overcome their fear of the unknown and make it back out of the forest alive.