The Dark Hills Divide is about a 12 year old girl named Alexa Daley. Alexa is a small skinny girl that loves to explore everything. Her dad is the mayor of Lathbury, a small town. Every summer, Alexa and her dad leave Lathbury to go to Bridewell. Bridewell is a town surrounded by walls that protect them from a monster in the Dark Hills behind the walls. One day Alexa was exploring the Bridewell castle where she was staying. She finds a small door behind a chair that turns out to be a tunnel through the wall to the Dark Hills. Alexa meets all the animals that live in the Dark Hills that suffer from the wall because they got separated from family and friends. She finds a stone that lets her talk to the animals. Alexa realizes that the walls aren't protecting them from a monster; they are the monsters. She solves the mystery behind the walls and finds out why they are there in the first place. The walls were originally prisons and the prisoners built a wall so that one-day they could trap the people inside and overthrow Bridewell.