Primatologist Davis Okoye shares an unshakable bond with George, the extraordinarily intelligent, silverback gorilla who has been in his care since birth. But a rogue genetic experiment gone awry mutates this gentle ape into a raging creature of enormous size. To make matters worse, it’s soon discovered there are other similarly altered animals. As these newly created alpha predators tear across North America, destroying everything in their path, Okoye teams with a discredited genetic engineer to secure an antidote, fighting his way through an ever-changing battlefield, not only to halt a global catastrophe but to save the fearsome creature that was once his friend.

It’s the true American story of a legendary family feud—one that spanned decades and nearly launched a war between Kentucky and West Virginia. The Hatfield-McCoy saga begins with Devil Anse Hatfield and Randall McCoy.. Close friends and comrades until near the end of the Civil War, they return to their neighboring homes—Hatfield in West Virginia, McCoy just across the Tug River border in Kentucky—to increasing tensions, misunderstandings and resentments that soon explode into all-out warfare between their families. As hostilities grow, friends, neighbors and outside forces join the fight, bringing the two states to the brink of another civil war.