This document summarizes the plot of "The Second Nun's Tale" by Chaucer. It follows Saint Cecilia, a Roman woman who converts her husband Valerian and his brother Tibertius to Christianity. They are arrested by the prefect Almachius and sentenced to death for their faith. Though ordered to be boiled alive, Cecilia remains unharmed. She continues preaching until being stabbed, dying three days later. The tale promotes religion as a theme of holiness and devotion to God.