Fireworks burst above a restaurant as chaos erupts inside. Two gunmen storm the building, unleashing terror on unsuspecting diners. Amid the mayhem, a group of survivors retreats to a fortified safe room, cut off from the outside world with no Wi-Fi or cell service. Is it a mass shooting event or something more sinister?
Tensions rise as they clash over whether to risk their safety to seek help or work together to save other survivors.
As desperation takes hold, revealing hidden motives and personal secrets, should they unlock the steel door to face whatever or whoever is waiting outside.