The arrival of an uninvited guest at the idyllic Dower House triggers a series of unsettling events that expose the malevolent nature of the estate. James and Nemo Boyce purchase the property, drawn by its aesthetic charm and riverfront location, only to find their domestic peace compromised. Professor Harry Harris enters the orbit of the house and its mistress, becoming entangled in a web of obsession. The narrative explores the psychological erosion of the inhabitants as the house exerts a sinister influence over those within its walls.

Readers and critics frequently categorize this work as a significant entry in twentieth-century gothic horror. Discussion often centers on the author's ability to maintain a high level of tension throughout the narrative without relying on overt supernatural tropes. Many highlight the effective use of the Dower House as a character in its own right, noting how the setting mirrors the internal decay of the protagonists. The prose is often described as evocative and precise, contributing to an atmosphere of dread that persists until the conclusion. Readers who appreciate character-focused horror that emphasizes psychological instability over visceral gore often find this title particularly effective.