What is The Book of Mormon about?

For the month of December, my thirteen year-old daughter and I made a goal to finish The Book of Mormon. She had already read a few chapters. I started from the beginning. I've read The Book of Mormon many times, but this was the fastest I've read the entire book. I read about eighteen pages a day. In reading the book at a faster pace, I was impressed by two themes.The Book of Mormon is a story about what happens when people follow Jesus Christ and when they don't follow Him. The Book of Mormon testifies of Jesus Christ.
The Book of Mormon is about two groups of people who were led to America before the birth of Jesus Christ. One group, the Jaredites, came to America after the Tower of Babel. The other group, the family of Lehi, were guided to the Americas about 600 B.C. When each of these people came to America, they were following Jesus Christ and His teachings. They were led by prophets who spoke with Christ and received revelation or words from Christ directing the people. They prospered when they kept the commandments. They suffered through wars, pestilence, and famines when they did not follow Christ. Before Lehi died, he counseled  his sons, " For the Lord God hath said that: Inasmuch as ye shall keep my commandments ye shall prosper in the land; and inasmuch as ye will not keep my commandments ye shall be cut off from my presence" (2 Nephi 4:4).
All of the prophets in The Book of Mormon before Christ was born, testified of Him. Nephi saw a vision which included Mary, "A virgin, most beautiful and fair above all other virgins," and then he saw that Mary would bear "the Lamb of God, yea, even the Son of the Eternal Father!" (1 Nephi 11:15, 21). Because of his faith the brother of Jared, the prophet of the Jaredites, saw the spirit body of Christ. Signs appeared to the people in America when Christ was born, a new star in the heaven and the night before he was born remained light as day (3 Nephi 1:15). After Christ died and was resurrected, he visited the people in the Americas. He taught them the gospel, healed them, and ordained apostles (3 Nephi). All the prophets after Christ testified that He had been born and that the people must keep His commandments. As the people become wicked and tried to destroy each other, Mormon, a prophet was told by Christ, "Cry unto this people---Repent ye, and come unto me, and be ye baptized, and build up again my church, and ye shall be spared" (Mormon3:2). The people did not repent and story of The Book of Mormon ends with the prophet in hiding and all who believe in Christ are killed.
When reading scripture, we should apply the teachings to ourselves. If I want to prosper, I need to keep the commandments. By reading the story in The Book of Mormon, I saw the cycle of righteousness and wickedness. I want to be righteous. I also want to follow Christ. Again, the stories from The Book of Mormon show me what happens when people follow Christ and when they don't. I want to have the faith of the brother of Jared, of Nephi, of Mormon that when I follow Christ, He will direct my life and I will be able to accomplish everything he has in store for me.