"Alone that same day I began my way southward, and for five days made good progress. On the eighth day I noticed, stretched right across the south-eastern horizon, a region of purple vapor which luridly obscured the face of the sun: and day after day I saw it steadily brooding there. But what it could be I did not understand."Adam Jeffson is the first man to ever reach the North Pole but, south of him, a deadly purple vapor spreads, passing over the...