Set in present day Chicago, the ancient avenging demon Lilith, attempts to destroy a young paramedic's life while destroying anyone who interferes with her plan.

Wes Clayton is a lawman and a bishop in a Mormon community called Brigham. The town is shaken when a woman from California is found murdered. Clayton and his young deputy work with an FBI agent sent to investigate. As a civil and spiritual leader in the frightened town, Clayton must uncover the town's deepest secrets, find the murderer and keep Brigham from ripping itself apart.