Having to do with the Book of Mormon, first published in 1830 as a translation of ancient historical and prophetic Christian records of one of the civilizations found in the Americas between 600 BC and 400 AD. It is the keystone to the question of the authenticity of the Church of Jesus Christ of Latter-day Saints, which claims to be part of the restitution of all things as predicted in Act 3:21, and many other prophecies.

Joseph Smith, the founding prophet of the church tells his story about the book here. More information about the origin of the book is here and the full text of it is here.