We have officially watched the entire season of Under the Banner of Heaven and have MANY thoughts about the last few episodes 😬 The Hulu series 'Under the Banner of Heaven' is based on a book written by Jon Krakauer. The series depicts the story of the Lafferty murders and focuses heavily on their faith as once members of the Church of Jesus Christ of Latter-day Saints. Both the writer of the book and the director of the series (and those involved with the show) are not members of the Church of Jesus Christ of Latter-day Saints (otherwise known as the Mormon Church).