Cat thought the Hydra epidemic was over, but when new cases pop up, Cat must team up with an enemy to fix the vaccine before the virus spirals out of control in this thrilling sequel to This Mortal Coil, which New York Times bestselling author Amie Kaufman says "redefines 'unputdownable.'" The nightmare of the outbreak is finally over, but Cat's fight has only just begun. Exhausted, wounded, and reeling from revelations...