Colin Pasmore, a man approaching thirty, struggles against a profound sense of existential dread that threatens to dismantle his stable family life. Despite possessing a comfortable job and a supportive household, Pasmore experiences recurring nightmares of failure that manifest as a physical inability to outrun his peers. To combat his mounting feelings of suffocation, he secures a private room in London to conduct an extramarital affair. The narrative follows his internal collapse as he attempts to reconcile his external success with an internal void that no amount of infidelity or escape can fill.

Readers and critics frequently highlight the stark, unvarnished portrayal of a man unraveling within the confines of his own normalcy. Discussion often centers on the effectiveness of the author's prose in capturing the specific, suffocating atmosphere of 1970s British middle-class life. The narrative is noted for its refusal to provide easy answers to the protagonist's existential crisis, focusing instead on the raw mechanics of his psychological decline. Many observers point to the balance between the protagonist's external actions and his internal turmoil as the primary driver of the book's tension. The work remains a subject of interest for those examining the intersection of personal identity and societal pressure.