A young schoolteacher's disciplined life is upended when a chance romantic encounter forces him to choose between his rigid academic ambitions and the unpredictable nature of love. Mr. Lewisham, an eighteen-year-old educator, finds his carefully constructed future in Sussex dismantled after falling for Ethel Henderson. Following a period of separation and his subsequent move to London to pursue scientific studies, their reunion introduces a volatile conflict between his burgeoning socialist ideals and Ethel's clandestine activities. The narrative, presented with the author's characteristic focus on social mobility and personal development, tracks the friction between individual desire and the constraints of Victorian class structures.

This novel is often regarded as one of the author's most grounded and intimate works, diverging from his later focus on speculative science fiction. Critics frequently highlight the precision with which the narrative captures the anxieties of early adulthood and the rigid social hierarchies of the era. The work is noted for its psychological depth and its refusal to offer a simplistic resolution to the protagonist's internal conflicts. Readers often find the portrayal of Mr. Lewisham's evolving political and personal identity to be a compelling study of human fallibility and growth.