Mormon, a young Nephite, is tasked with preserving and abridging the sacred records of his people. His early life, his appointment by Ammaron to oversee the records at age 10, and his leadership during a time of war and wickedness among the Nephites are depicted. His efforts to maintain the historical and spiritual records amidst a declining society are highlighted, as well as his observations of their moral decay and eventual destruction due to their rejection of God. This episode emphasizes themes of duty, faith, and the preservation of truth.