Beyond the Valley of Mist
by Dicksion, William Wayne
Two young stone age couples want to marry, but the priests will not permit it until the girls are first impregnated by the priests. Girls who refuse are sacrificed to the Fire God. Lela and Ador, with their young men, try to escape into the dreaded Valley of Mist. No one knows what lies in the mist because none has ever entered it and returned.