A reclusive man's life becomes intertwined with the ancient, sentient forest surrounding his home. The narrative follows the protagonist as he develops an increasingly profound and unsettling connection with the woods, blurring the lines between his own consciousness and the primal life of the trees. He grapples with the encroaching influence of the forest, which offers both a strange solace and a terrifying loss of self, while external forces, perhaps human or supernatural, threaten this delicate balance.

The collection is noted for its atmospheric and psychologically unsettling exploration of nature's darker, more mysterious aspects. Readers often comment on Blackwood's ability to evoke a sense of profound unease and the uncanny through vivid, sensory descriptions of the natural world. The stories tend to focus on the subtle erosion of human consciousness when confronted with primal, ancient forces, leaving a lasting impression of the sublime and the terrifying. This work is frequently cited as an example of early 20th-century supernatural fiction that prioritizes mood and psychological depth over overt scares.