On the first part of the movie, it shows the mathematical life of John Nash but on the later part, we see the devastating impact of his mental illness to his brilliant mind.
When Nash was working as a teacher at MIT, he met Alicia Larde, her student, and got married with her. Meanwhile, the U. S. government asked his help to break codes which soon gets him involved in a terrifying conspiracy plot. Whenever Nash looks at newspapers, he could see codes which made him popular and in great demand to work for the government. Whenever he breaks a code, he would send it to a house and place it in a mailbox. But one day, people came after him and his friend from the US government, William Parcher, and started shooting them.
Nash became paranoid. He would always look at the windows, turn off the lights at their house, but would never tell Alicia, who was pregnant at that time, the reason behind this. At MIT, he met Charles who was with Marci, Charle’s niece. He was about to tell Charles what happened but during Nash’s speech, a psychiatrist took him to the mental hospital. At the office of the psychiatrist, Nash was looking at Charles. He was blaming and accusing him of being responsible for being brought to that hospital. But… Charles was not there. Who did Nash saw? Who was he talking to? No one. Nash was having hallucinations and delusions. The military thing, code breaking, Charles, Marci and Parcher existed in Nash’s mind only.
Because of this, he was confined to the hospital and was treated. Alicia was always beside Nash. Years later, Nash...