Moses Herzog, a professor experiencing a profound personal and mental breakdown, attempts to reconcile his chaotic internal life with the collapse of his marriage. Following the departure of his wife, Madeleine, for his closest friend, Herzog retreats into a state of intense isolation within his dilapidated home. He navigates his distress through the composition of unsent letters to friends, enemies, and historical figures, creating a complex narrative framework that oscillates between his present solitude and vivid, intrusive memories. His objective is to find meaning or intellectual order amidst the wreckage of his personal relationships and professional failures.

Discussion often centers on the effectiveness of Bellow's prose in capturing the frantic, hyper-intellectual state of the protagonist. Readers frequently highlight the balance between Herzog's internal monologues and the external reality of his crumbling life. Critics often note the novel's exploration of the tension between high-minded philosophical ideals and the messy, often painful nature of human connection. The narrative's pacing is frequently described as reflective of Herzog's own mental state, moving rapidly between past and present. Many readers find the work a significant examination of the modern individual's struggle to maintain sanity in a world that feels increasingly fragmented.