The explosive new thriller featuring Kate Maddox from the writers of Catch Your Death and Killing Cupid. Two years on from saving her son from the brink of death and uncovering the murderous work of a psychopathic scientist, all Kate Maddox wants is to lead a normal life with her partner Paul and her son Jack. But with a deadly virus spreading through L.A. her world is once again turned upside down. Called upon to join a specialist team formed to find the cure, Kate soon finds herself in a secret laboratory in the heart of California. Separated from Kate, Paul sets out on his own investigation, hunting down revenge for his dead brother, and soon discovers that the current outbreak may have more to do with the past than they had realised. Will they be able to find the antidote in time? And who are the mysterious 'Sisters' that seem to be working against them? As the death count hits one million and the virus continues to spread, Kate and Paul are in a race against time to save their loved ones.