We learn the brief, yet remarkable biography of prophet Mormon. As he recounts his life experiences, we witness the early signs of his greatness when he was just a boy. Chosen by the Nephite historian Ammaron, Mormon is given charge of the sacred records.

Amidst a backdrop of wars, political upheaval, and spiritual corruption, we follow Mormon's journey from a young observer to the commander of the Nephite armies. As the Nephites face relentless battles against the Lamanites, Mormon continues to plead with the Nephites to repent and look to God for their hope and for their success. Despite moments of victory, the pervasive wickedness among the Nephites leads to devastating consequences as the entire Nephite nation is destroyed.