Serenity House buildings will be demolished soon, but tenants are worried higher than the nearest outlet. Anyone approaching windows is shot dead by a sniper, who wants to eliminate all witnesses to a crime committed a year ago. A young man was beaten to death on the last floor lobby and only one person, Becky, tried to intervene and save him. Three months after Becky witnessed the beating, a sniper shoots him across the street for breakfast the man with whom the woman had an affair that night. Residents of buildings proposed for demolition are isolated from the world by a series of traps and its stop signs on outsiders to approach.