The Dark Hills Divide introduces readers to Alexa Daley, who annually visits the town of Bridewell. Alexa is curious about what lies beyond the massive ramparts that surround the city and the walled roads that link Bridewell to nearby towns. Soon after town leader Thomas Warvold passes away, Alexa finds herself outside the walls, acquires a stone with remarkable powers, and discovers that she's meant to stop a potential war from occurring.

Inquisitive twelve-year-old Alexa Daley is spending another summer in the walled town of Bridewell. This year, she is set on solving the mystery of what lies beyond the walls. Legend says the walls were built to keep out an unnamed evil that lurks in the forests and The Dark Hills. But what exactly is it that the townspeople are so afraid of? As Alexa begins to unravel the truth, pushing beyond the protective barrier she's lived behind all her life, she discovers a strange and ancient enchantment and exposes a danger that could destroy everything she holds dear.