When the express elevators in the Millennium Building, one of New York's most famous landmarks, start to malfunction and behave in erratic ways, elevator mechanic Mark Newman is sent out to find the cause of the problems. His investigation meets unexpected resistance and not everybody seems to be happy with his involvement. After a gruesome and deadly incident, in which a blind man falls into the shaft and a security guard is decapitated, the police start an investigation. They are however not very successful. Mark is determined to find the cause. He is joined by a female reporter, Jennifer, who is looking for a juicy story. Together they try to unravel the secrets behind the mysterious behaviour of the elevator that seems to have a life of its own. When things get worse and death toll rises, The Government, fearing terrorists are involved, seal off the building. What at first looked like a routine job turns into a horrifying nightmare in which Mark has to face an enemy whose blood thirst is only met by its unpredictability. An enemy that is determined to fight off any intruder looking for the dark secret that lurks inside the belly of the building. An enemy that has to be feared. An enemy that has to be taken .......DOWN.