The narrative centers on the psychological collapse of soldiers during World War I and the controversial medical efforts to return them to the front lines. Dr. W.H.R. Rivers, a psychiatrist at Craiglockhart War Hospital, faces the ethical dilemma of treating officers like Siegfried Sassoon, whose public protest against the war has led to his institutionalization. The story examines the tension between the duty to heal and the duty to serve, utilizing a grounded, clinical prose style to navigate the trauma of the trenches. Through the interaction of historical figures and fictionalized patients, the text explores the fragility of the human mind under the pressure of industrial warfare.

Regeneration is widely regarded as a significant contribution to the literature of the First World War for its unsentimental approach to psychological trauma. Critics frequently highlight the author's ability to balance historical accuracy with a nuanced exploration of moral ambiguity. Readers often note the effectiveness of the dialogue-driven scenes between Rivers and his patients in conveying the internal struggle of the characters. The work is consistently praised for its refusal to offer easy resolutions to the complex issues of war and mental health. This novel remains a staple in discussions regarding the intersection of history and fiction.