 After falling victim to a burglar, Nelson, a wealthy businessman, takes a trip to the desert with his wife Margo and lawyer/friend Jack. The trip takes an unexpected turn when Jack helps Nelson over a cliff. Jack and Margo return to the site with the sheriff only to discover Nelson s body is missing, indicating he is still alive. As Nelson struggles to survive against madness and the elements, two separate searches for him are conducted--one by an increasingly suspicious sheriff and the other by the treacherous Margo and Jack.