Q arrives on a white horse: Conspiracy theories among Mormons, or why does America's 16-million-strong religion tend toward QAnon? deals with Mormon conspiracism, the belief in conspiracies among members of the Mormon religion. The author examines how conspiracy theories are reflected in Mormon culture, history, and faith and how they were influenced by the emergence of Denver Snuffer's modern neo-fundamentalist movement. Using the example of the new age movement and Mormon preppers, the author shows the growing influence of conspiracy thinking and its connection to Donald Trump and the QAnon theory. Using the story of Nathan Wayne Entrekin, one of the participants in the January 6, 2021, insurrection who came dressed as a warrior from the Book of Mormon, he elaborates on the fundamentalist and conspiracy roots of early Mormonism in the times of Joseph Smith. That is combined with multiple testimonies from John Dehlin's Mormon Stories Podcast as it reflected the apocalyptic Mormon milieu from 2010-2020. In the final part, the author analyzes Mormon neo-fundamentalism through the social myth theory of Radek Chlup, who describes three categories of myth (political, fictional, and conspirator) and how they affect the popularity of these myths.