6th Century, Frankish Kingdom — Bashina, a noble-born nun descended from the Neustrian royal line, endures constant torment at the hands of her two cruel stepsisters. Within the walls of their cloister, the sisters hold absolute power, silencing any opposition and ruling the convent with iron piety. Taught to suffer in silence under the commandment "Forgive thine enemies," Bashina endures her suffering alone. But fate shifts when Princess Clotilda of the Kingdom of Paris sets out on a pilgrimage to the very convent where Bashina resides. Their fateful meeting ignites a spark that cannot be extinguished. As long-held tensions simmer, Bashina and the other oppressed nuns begin to awaken to the injustice around them— and so begins a holy rebellion that will shake the sacred walls of the convent, and the very foundations of the kingdom. In a world where mercy was demanded of women, one nun dares to choose justice instead.