How does the last paragraph sum up the events that led to the writing of the book.

Rebecca finishes the book and tries to call Deborah in order to read it to her, but Deborah doesn't answer the phone. Finally, Sonny tells Rebecca that Deborah died quietly in her sleep of a heart attack. Deborah was happy when she passed: her grandchildren were doing well in school, and she knew that Rebecca would tell Henrietta's story.

Rebecca recalls the time she spent with Deborah, and she rematches the BBC documentary in which a young Deborah was interviewed about her mother's cells. Rebecca remembers when Deborah said that heaven must look like Clover, Virginia. She says immortality doesn't sound all that great because you'd be lonely, but she also thinks that she'd be okay coming back as a HeLa cell line, so that she and her mother could do good in the world together.