"He Knew He Was Right" by Anthony Trollope unfolds the tragic tale of Louis Trevelyan, a man whose obsessive jealousy unravels his marriage and his life. Confident in his suspicion about his wife Emily's fidelity, Trevelyan's relentless pursuit of control and vindication leads him down a path of emotional turmoil and isolation. Set against a rich tapestry of Victorian society, the novel explores themes of trust, power, and the destructive nature of unwarranted suspicion, offering a deep psychological portrait within a compelling family drama.