Neffy is a young woman running away from grief and guilt, and the one big mistake that has derailed her career. When a debilitating new virus sweeps across the globe, volunteering in a vaccine trial offers her a way to make up for her past. But then, the virus mutates, and the future she had dreamed for herself is gone.
As the London streets outside the medical unit fall silent, and food begins to run out, Neffy must decide where safety lies. Might she find solace by revisiting her own heady memories of the past? Can she trust the strangers trapped inside with her - despite her growing suspicions? Or is her best chance of a future to be found in the terrifyingly unknown world outside?