Fifteen-year-old Bridget Liu just wants to be left alone: by her mom, by the cute son of a local police sergeant, and by the eerie voices she can suddenly and inexplicably hear. Unfortunately for Bridget, it turns out the voices are demons - and Bridget has the rare ability to banish them back to whatever hell they came from.

Terrified to tell people about her new power, Bridget confides in a local priest who enlists her help in increasingly dangerous cases of demonic possession. But just as she is starting to come to terms with her new power, Bridget receives a startling message from one of the demons. Now Bridget must unlock the secret to the demons' plan before someone close to her winds up dead - or worse, the human vessel of a demon king.