A deadly new outbreak is spreading through the cities, transforming ordinary people into terrifying bioluminescent entities. As entire neighborhoods fall under quarantine, Vail follows the trail of the mysterious infection and discovers that the plague isn't a natural phenomenon. Someone is deliberately spreading it and every clue leads closer to a hidden figure determined to turn humanity into something new. But the infected aren't simply monsters. Some of them are still conscious. Now Vail must fight her way through the growing outbreak, uncover the identity of the person behind it, and find a way to stop the plague before it reaches every city.