Nathan Alice is a gifted teenager, he lives in a familiar and beloved world of numbers. Since childhood, he was not particularly distinguished by the desire to communicate, it was much more interesting to add and subtract numbers, and with age came the ability to produce more and more interesting mathematical actions. The exciting world absorbs the boy more and more. People think he's a genius, but he doesn't care. Parents are concerned about the son's isolation and decided to examine him. Doctors after communicating with the patient confirm the fact of his unusual behavior, moreover, Nathan found signs of autism, and if you do not take action, the disease will begin to progress. The trouble that befell the family makes the hero of the film even more closed-his father dies, and the boy, not knowing how to cope with the tragedy, goes deeper into the world of mathematical action. Only close friend, Nathan connects with reality, becoming teacher of mathematics. The elder friend sees in his pupil not only a brilliant mathematician, but also a vulnerable child with a trembling soul, who just needs help. The teacher presents Nathan's candidacy to participate in the international Olympiad from great Britain. The boy is flattered, but very afraid, because winning such competitions involves the ability to work in a team.