The Gates of Byzantium (Purge of Babylon)

Man is no longer at the top of the food chain. The Purge has devastated the globe, turning much of humanity into night-dwelling, bloodthirsty creatures (dubbed "ghouls" by the survivors), while small pockets of remaining humans have managed to carry on. With the loss of their sanctuary, Will and his small band of survivors are forced to seek shelter elsewhere. Following the call of a mysterious radio broadcast, they make the treacherous journey to Louisiana, where an island might hold the key to survival. Along the way they meet new survivors, clash with new enemies, and renew old acquaintances that have been forever altered. Collaborators--humans working with the ghouls--are more dangerous than ever, and the ghouls have begun a new phase of their domination. Will learns that a larger war between survivors and ghouls is raging in the rest of the country, but before he can join the fight, he must first ensure the continued survival of his group at all costs. Where The Purge ends, the Gates beckon...