Tyler is lost. He wakes up with no memory in the middle of Central Park, and he doesn't recognize Hazel March or Luke Cast who claim to be his friends. Things only become stranger when Tyler, Luke, and Hazel are attacked by monsters, and they learn that they're descendants of immoral beings called Creators who have sworn to protect the world from monsters and other threats. Suspicions grow when Tyler learns that someone purposely stole his memory and NYH, the home for creators, is attacked by monsters. With a mysterious enemy on the rise, the identity of their enemy might be in Tyler's memory. But in the quest for curing his memory loss, Tyler, Luke, and Hazel discover that they're just one part of their enemy's terrifying plan.
Seeking justice from the attack of the evil beasts, Gabriel begins to train average men into soldiers. Determined to keep their city safe from the monkouts men from the city volunteer to fight and even die if they have to.
Lisa and Kayla find themselves far from home and have to find a way back to their city. The sworn enemies must try to find a way to live and work together for the same purpose, but they will face many obstacles. Being lost in a unknown world, they find out what they are really made of and find things they thought they had lost.