In his superior British drama A Brilliant Young Mind, director Morgan Matthews (a documentarian making his fiction-film debut) endeavors to show us something of what synesthesia might feel like. Nathan (Hugo’s Asa Butterfield), a teen math whiz, stares at wafer-flat street lights that haze and swim over restless, disorienting imagery, some really there before him and some edging in from elsewhere in the brain. You’ll likely tense up, knowing that if the kid drifts off, something awful might happen. That’s about the only fresh technique the filmmakers invent; otherwise, they leave the mysteries of the brain to their actors, which is probably just as well.
Thus, unlike its hero, A Brilliant Young Mind can’t convincingly show its work. But the kind of drama that movies are good at is very good here, indeed. Butterfield plays Nathan as brusque and shy, incapable at first of opening up to the world or to the mother (Sally Hawkins) who lives in awed fear of him. She apologizes, relentlessly, any time she seems to have bugged him, and her voice frays into a ragged toughness as she orders Chinese food for him: The kid needs his meal’s menu number to be a prime, and it must have exactly nine prawns. (He connects with numbers, not people, especially since the death of his father some years before.)
Hawkins is often wonderful on the screen, even in this year’s slight Paddington, but this performance is a triumph of small gradations of articulated feeling: Every fear, every hope, every pain lights across her face, even as her character, Julie, tries to stanch it all, to reveal nothing more than warmth and her eagerness to love. That eagerness isn’t just directed toward Nathan. In the film’s most surprising and delicate scenes, Julie finds herself wanting to spend time with Nathan’s math mentor, Mr. Humphreys (Rafe Spall), a once-promising mathematician who is charming, embittered, and living with MS. These are the finest scenes of adult courtship this side of Blythe Danner and Sam Elliott in I’ll See You in My Dreams — and, as in that small marvel of a film, the complications these grownups face feel like the grinding of the world rather than the delay tactics of screenwriters.
Nathan, meanwhile, makes the United Kingdom’s squad in the International Mathematics Olympiad, winning himself a trip to Taipei with kids like him from around the world — and the romantic interest of the first young woman he’s ever met whose thinking resembles his.
The film is novel-rich, so full of life that you might not notice how familiar it is: Here’s the young genius entering a major competition whose final contest comes not long before the credits roll; here’s the troubled young man learning to open up and maybe even love; here’s awkward first kisses and a mentor with something to prove to the world. But nothing here works out the way it usually does on screen, with that one gently disappointing exception: The filmmakers illuminate something of what it’s like to live and grow, but little of what it’s like to inhabit a mind that’s likely quite different from yours.