Oliver, a social misfit from a lowly northern background befriends another student at Oxford, a handsome aristocrat, who invites him to spend the summer at his family's country house. The ridiculous opulence of the house, more a palace, is only matched by the eccentricities of the family, utterly divorced from the bulk of society and just regarding Oliver as their son's latest pet.
The film then swings from social satire to thriller, as Oliver, while erotically obsessed with the son, coolly begins to exploit cracks in the fabric of the family and bring them down. This plays out more in the fashion of The Talented Mr. Ripley than Kind Hearts and Coronets, but with a degree class envy/hatred and calculated sociopathy well in excess of what Patricia Highsmith could have conceived.
The casting is immaculate, from Barry Keoghan's scheming interloper to Rosamund Pike as the vacuous, self-centred materfamilias, the setting quite otherworldly, but the descent into Hitchcockian disintegration of all that stands is signposted too soon and too blatantly. Still, there are enough compelling scenes and lashings of stylistic excess to make it an animal of uncommon properties larger than the sum of its manifold sources.
7/10