A socially awkward teenage math prodigy finds new confidence and new friendships when he lands a spot on the British squad at the International Mathematics Olympiad.
One of the purest, most tender and most beautiful performances of the year comes from Sally Hawkins as the loving single mother of an off-the-charts brilliant teenager incapable of expressing love. It's the best thing in a conventional but well-crafted story of a boy unlikely ever to have a normal social life. - Three stars