This is a book about what might have been. What if Joseph Smith had survived Carthage Jail and had gone on to run for President of the United States? Would he have been successful? Would the Civil War have begun in 1845, as a result?
This style of writing is called “counterfactual history”. You will go away thinking, “Yes, it really could have happened this way”.
In Book Three, a civil war looms. The Nauvoo Legion is conscripted into the U.S. Army, with Joseph Smith at its head. Joseph leads a campaign to emancipate the slaves and return the southern states to the Union. Brigham Young leads an advance party of Saints from Nauvoo to the Rocky Mountains. At the end of hostilities, Joseph Smith returns to the White House, only to face his greatest challenge.