This rare and astonishing novel was first published in 1935, and is the only SF-work of an unknown British writer.
Imagine Helioxenon, a city built 17 kilometers below the Indian Ocean to save mankind from a coming cataclysm.
But the mastermind who rules it needs the help of the three worlds he is in contact with, and which refuse
to interfere with destiny. So it seems that mankind is doomed. Untess the fourth world...