A young man enters the household of a brilliant physicist, only to find himself entangled in the complex and volatile emotional life of the man's wife. The protagonist, John Rivers, serves as the narrator, reflecting on his youthful experiences as a tutor for the Maartens family. He faces the challenge of navigating the intellectual brilliance of the husband, Henry, against the profound, almost elemental nature of the wife, Katy. The narrative operates as a retrospective account, examining the tension between cold scientific rationalism and the messy, unpredictable reality of human desire and suffering.

This work is often analyzed for its departure from the author's earlier, more satirical novels, favoring a more intimate and somber tone. Readers and critics frequently note the sharp contrast between the titular characters, which serves as the primary engine for the book's philosophical inquiries. The narrative style is characterized by a deliberate, measured pace that allows for deep introspection regarding the limitations of the human mind. The book remains a significant point of discussion for those interested in the intersection of scientific thought and the complexities of the human heart.