A framed set of notebooks delivers a first-person account by a man who returns from polar travel to find a mysterious purple cloud has devastated the human population. Alone, he wanders through empty cities and altered landscapes, recording the practical difficulties and psychological strain of solitary survival. He interweaves travel episodes with recollections of trance-like visions and occult reports, and he reflects on mortality, companionship, scientific curiosity, and the breakdown of social order. The narrative balances vivid description, melancholic introspection, and philosophical questioning as it chronicles life after an unprecedented catastrophe.