I would say the turning point, or climax, occurs when Nick seeks the help of Mrs. Granger. She knows that he is unhappy and not his usual self. His celebrity status has turned off his creativity and stunted his lively personality. Mrs. Granger counsels him to ignore the money and fame his "frindle" stunt and to just be himself. She relates to Nick in a one-on-one conversation which lets him know she is not the regimented classroom teacher everyone thought she was. She was proud of his creative genius which her "look it up in the dictionary" response stimulated. Nick accepts her advice and goes on to reform the school cafeteria and proceed successfully into an educated adulthood with the added windfall of his trust. In the conclusion, he acknowledges her influence on his life with a million dollar trust for educating children in her name.