Perfect World - Ella Scrymsour

Almost certainly the merging of two separate magazine novellas, where Scrymsour attempted to weave together the plots. In this fantasy/ science fiction novel, the two young gentlemen protagonists are transported from a company town dominated by their family coalmine into an underground cave system where an oligarchic exiled race of dwarf Israelites has lived for 3000 years and grown horns. More space and time travel follow bringing our heroes to Jupiter, where romance follows. - Summary by Lynne Thompson