The twelve / Cronin, Justin

A man-made apocalypse threatens mankind. Three strangers navigate the chaos: an expectant mother, a teenage girl, and an armed loner. One hundred years later, their survival leads to a battle to vanquish the Twelve, a dozen humans transformed by an ancient virus into a terrifying threat that will bring what is left of the human race to what survivors think will be the brink of annihilation. But the enemy has evolved with a new plan more horrifying than man's extinction. To bring the Twelve down, one of humanity's heroes will have to pay the ultimate price.

In the present, three individuals--Lila, a pregnant doctor, Kittridge, a loner, and April, a teenager caring for her younger brother--struggle to survive as a man-made apocalypse unfolds. While, one hundred years in the future, Amy and others support the Twelve as they fight a dark enemy with plans for humankind that are worse than extinction.