First edition. 8vo. Original cloth. Dust-jacket. Some mild toning to margins, prize bookplate to front free endpaper; very slight mottling to cloth, but overall VG+; dust-jacket double-clipped on front flap, slightly worn at corners and spine ends, a few small closed tears, overall VG. Black & white plates. Dust-jacket artwork signed S.D. The only work of sci-fi from an author normally associated with more sedentary works on transport; this Lost Race tale set in the Yukon Territory, 'within a caldera heated by volcanic action, a technologically advanced but priest-ridden civilization of "white Indians", originally from ancient Egypt, uses its helicopter-like airships and strange Weapons to attempt to protect its gold from the outer world.' (The Encyclopedia of Science Fiction). The Encyclopedia of Science Fiction.