It's Christmas Eve, the city goes dark, and the few remaining tenants of The Ravenwood find themselves trapped in their building. And they are not alone.

After the city falls suddenly dark, the residents of a multistory building are faced with a hideous monster, who, apparently, was the cause of the people fallen on adversity. To confront bloodthirsty creatures killer moves on the floors, the neighbors together. But not many will survive this.—Masood Meery, Mashhad, IRAN