Charlie and Algernon stop racing each other. Now they share a bond as Charlie feeds him and plays with him.
Charlie months into the experiment has tripled his intelligence. He has learned a lot of languages and finds the field of science and math fascinating unlike ever before.
Charlie visits Algernon he showed increased aggression to him and staff, when he went through the maze he got lost. Dr. Strauss says that he is loosing the intelligence he once had and it worries Charlie.
Algernon dies after his intelligence has returned to normal and this worries Charlie as he too has taken the same surgery and as he saw Algernon's brain deteriorating it made him think if it would happen to him too.
Charlie looses his intelligence that he once craved for he suddenly can't spell well forgets the languages he learned he has images of his parents while loosing his intelligence he earns back his memories.
Nothing happens to charlie fortunately, eventhough he lost his intelligence he says that he would still try his best to improve by himself and he leaves all his friends at New york to somewhere else where he wont make his friends worry and feel sorry for him.