Fifteen-year-old Clara Dune has a secret. She suspects shes adopted, but shes afraid to discuss it with her father, who recently moved the family to St. Augustine, Florida to complete an archaeological dig thats tied to secrets of his own. He distracts her by giving her an old book that tells the story of a saintly Augustine pitted against a wicked Faustus. Strangely, sparks fly from the books illustrated pages as a battle between good and evil comes to life. And Clara suddenly finds herself in the middle of an ancient feud.

Shortly after, a solar eclipse ominously cloaks her new hometown in...