A serial killer armed with a crossbow pistol is murdering people from their own rooftops. When three young coworkers at a poorly-attended slumber party start hearing footsteps on the roof, t... Read allA serial killer armed with a crossbow pistol is murdering people from their own rooftops. When three young coworkers at a poorly-attended slumber party start hearing footsteps on the roof, they fear the worst.A serial killer armed with a crossbow pistol is murdering people from their own rooftops. When three young coworkers at a poorly-attended slumber party start hearing footsteps on the roof, they fear the worst.