“Redmond Barry,” portrayed by Ryan O’Neal, finds himself enamored with his cousin “Nora” (Gay Hamilton), but her family requires the annual sum of £1,500 from “Capt. Quin” (Leonard Rossiter). To facilitate a separation, they orchestrate a scenario that sends this young man toward Dublin's allure. During his travels, he crosses paths with a highwayman, leading to an unexpected enlistment in the army. This turn of events proves beneficial, as it propels him on several continental escapades where he observes “Lady Lyndon” (Marisa Berenson), a woman of considerable wealth. She is bound to a declining British parliamentarian, already a mother to one son, and experiencing dissatisfaction with her circumstances. Recognizing an opening, the opportunistic "Barry" intensifies his efforts and soon finds himself immersed in a life of opulence—complete with a wife, their own son “Brian,” whom he adores, and a stepson who gradually begins to perceive the true nature of his father’s dishonesty and extravagance. This younger man lacks the strength to confront him, but as his inheritance vanishes at an alarming rate, it remains to be seen when he will feel compelled to intervene. The film unfolds deliberately, occasionally feeling somewhat disjointed in its progression, yet largely providing a platform for O'Neal to showcase his range—transforming from a charming rogue into a decidedly unpleasant individual. Berenson also delivers a strong performance as a woman navigating the precarious edge of sanity with diminishing assurance. A genuine tragedy striking their family elevates the underlying tension to a tangible degree, and Stanley Kubrick manages to maintain this atmosphere without resorting to unnecessary violence, allowing psychology, jealousy, and fear to take center stage. The film’s visual presentation is impeccable, boasting authentic costumes and sets—ranging from modest dwellings to grand estates like Blenheim and Chatsworth—that vividly enhance the cinematography. Ultimately, the narrative blends elements of envy and cautionary tales, making it a worthwhile experience spanning three hours on a large screen if you have the time.

Source on TMDB