Anaheim Run: Endworld Series, Book 13

Fierce beasts masquerading as men, the Assassins were as dedicated to destroying life as Blade and the Warriors were to preserving it. Using advanced weapons and primitive instincts, they vowed to die before admitting defeat. When the Warriors trapped the Assassins in an abandoned amusement park, the stage was set for an all-out war that would decide the fate of an already desperate planet.