Brilliana Harley is a seventeenth century Puritan, and a Roundhead in a county of Puritans. Driven to defend both her beliefs and home in the front of total aggression, Brilliana must take charge and defend her home, all the while consumed with longing for an absent husband. She soon comes under a brutal and unrelenting siege, and will struggle to survive. In the present day, Mia Morgan is researching the life of Brilliana Harley, hoping to finish a book begun by her late ex-lover. As she struggles to come to term with her grief, and to rebuild a life from what she has left, Mia finds her life becoming irrevocably entwined with that of the tragic Brilliana.