Robert died anyway, and Catherine was heartbroken, and she shut herself up. Katherine is furious when Robert's student Hal (Jake Gyllenhaal) tries to find the math notes left by her teacher. Sister Claire (Hope Davis) hopes her sister Katherine can sell her father's house and move to New York with her. Because she felt that her sister might have inherited some of her father's symptoms, and wanted to take care of her sister in time. Katherine didn't want to leave at all, and her relationship with Hal became complicated at this time.
Hal took the key given by Catherine and opened Robert's drawer, and a mathematical sample appeared in front of him. He was so happy that he proposed to publish the material in Robert's name, but who was the author? Hal and Claire All were taken aback.
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