Saints are not born. Saints are made.

Told against the fourth-century backdrop of the fall of the Roman Empire and the rise of Christianity, The Saint's Mistress breathes life into the previously untold story of Saint Augustine and his beloved mistress. Defying social norms and traditions, the love between the Roman aristocrat Aurelius Augustinus and Leona, a North African peasant, creates a rift with Aurelius' mother Monnica, his powerful patron Urbanus, and the marital laws of the Roman Empire. When Monnica and Urbanus succeed in separating Leona from her son and securing a more suitable fiancee for Aurelius, Leona commits herself to the Church.

Feeling the ever stronger pull of the evolving Christian church, Leona and Aurelius walk separate paths in service of their faith. When many years later Leona and Aurelius, now Bishop Augustine, meet again, old passions re-ignite, perennial feuds smolder, and the fate of the Roman Empire in North Africa hangs in the balance.

A love story for the ages, The Saint's Mistress brings to life the monumental struggle between love, faith and religious office.