Twice in the final years of his life, Elder Neal A. Maxwell told a grandson of Henry Eyring"s, You need to write your grandfather"s story. This is that story of Henry Eyring, perhaps the most acclaimed scientist ever to come from The Church of Jesus Christ of Latter-day Saints. It is a book about science and Mormonism, written to be easily understood by newcomers to both subjects. It demonstrates why one of the Church"s highest-profile intellectuals was also one of its humblest believers. In fact, this story of Henry Eyring shows how intellect and belief go hand-in-hand and how simple, faithful people can change the world.