They thought they were safe . . . A global outbreak of a virus sends society spinning out of control. But a small group of people have been preparing for a day like this. Grabbing only the essentials, they head to The Sanctum, a luxury self-sustaining underground survival facility where they'll shut themselves away and wait for the apocalypse to pass. All the residents have their own motivations for buying into the development. A mix of personalities, they are strangers separated by class and belief, all of them hiding secrets. They have only one thing in common: they will do anything to survive. The doors close, locked and secured with a combination that only one man knows. It's the safest place they could be. Nothing could go wrong. They're ready for anything . . . But when a body is discovered, they realize that the greatest threat to their survival may be trapped in The Sanctum with them.