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 realise the greatest threat to their survival may be trapped in The Sanctum with them.
Sarah Lotz and Louis Greenberg met in a pub while bunking a crime seminar and, as one does at pubs, discovered a mutual interest in horror. Sarah, a crime novelist and screenwriter, was a die-hard zombie fanatic; Louis, a literary writer, editor and recovering bookseller, had studied vampire and apocalyptic fiction. Rejecting their initial plans for a vampire-vs-zombie faceoff, they decided to write the first mainstream South African horror novel together and S. L. Grey was born.