 A young woman who moves into a new apartment building notices that her neighbors are a little strange. Not only that, but she witnesses the dissapearances of some people by the hands of her neighbors. Slowly she discovers four things: 1) her neighbors are part of a coven; 2) They sacrifice people by taking them to the 13th floor; 3) There is an axe-wielding maniac on the 13th floor; and 4) There is no 13th floor... She enlists the aid of some friends to try to stop whatever is going on in her apartment building, and they all face the terror of the 13th floor...