The death of the Bishop of Barchester triggers a fierce power struggle for control of the diocese, pitting the ambitious Archdeacon Grantly against a host of new, scheming arrivals. The protagonist, Septimus Harding, finds himself caught in the crossfire of ecclesiastical politics as he navigates the shifting allegiances of the cathedral close. Opposing forces, including the manipulative Mrs. Proudie and the obsequious Mr. Slope, utilize social maneuvering and clerical influence to secure their own advancement. The narrative employs a third-person omniscient perspective, frequently breaking the fourth wall to offer wry commentary on the characters' motivations and the absurdity of their social posturing.

Barchester Towers is widely regarded as a quintessential example of Victorian social satire, celebrated for its keen observation of human nature and institutional folly. Critics frequently highlight Trollope's ability to render the mundane politics of a cathedral town with both humor and profound psychological insight. The work is often praised for its balanced characterizations, where even the most antagonistic figures are granted a degree of depth that prevents them from becoming mere caricatures. Readers continue to engage with the novel for its enduring relevance regarding the dynamics of power, ambition, and social influence within closed communities.