William Whittlestaff faces a moral and emotional crisis when his ward, Mary Lawrie, remains devoted to a suitor who has long been absent in the diamond fields. Whittlestaff, a man of rigid principles and advancing age, finds his quiet life disrupted by his growing affection for Mary, whom he has taken under his protection. He must navigate the tension between his desire for companionship and the reality of Mary's unwavering commitment to John Gordon. The narrative, presented in a traditional third-person perspective, examines the constraints of Victorian social expectations and the internal conflict of a man who believes he has earned the right to happiness through his generosity. The story unfolds as a study of duty, sacrifice, and the complexities of romantic attachment across generational lines.

Readers and critics often note that this work serves as a poignant, understated conclusion to Trollope's prolific career. Discussion frequently centers on the moral ambiguity of Whittlestaff's position and the author's ability to render a sympathetic portrait of a man whose desires conflict with his sense of honor. Critics highlight the novel's focus on character development over dramatic incident, noting that the narrative relies heavily on the internal shifts of its central figures. Many readers appreciate the subtle irony and the precise observation of Victorian social mores that define the author's style. The book is widely regarded as a significant, if lesser-known, exploration of the complexities inherent in late-life romance.