A group of British Celts-Dumnonii of the 7th century AD, who fell into the Stone Age while trying to escape the attack of wild Saxons, gradually settle into the Fire Tribe, coming to the understanding that they will live here all their lives. Will the newcomers be able to understand and accept the way of life set by the Progressors for a society consisting of people from various tribes and peoples? How will the difference in worldview affect both? Will Father Boniface succeed in his epic plan to create the Scripture of the Sixth Day of Creation? And will the appearance of a Christian clergyman contribute to the emergence of a meaningful spiritual life in the Tribe of Fire?