Anna came into the world by in vitro fertilization so that she would be a genetic match for her older sister Kate, who was diagnosed with acute promyelocytic leukemia when she was 2 years old. When Anna was born, her cord blood was donated to her sister, but when the leukemia returned she then had to donate blood and bone marrow. When Kate’s kidneys fail Anna is expected to donate a kidney to save her sister, but she hires a lawyer to be medically emancipated from her parents and gain the right to make the decision for herself. Her lawyer, Campbell Alexander, works for her pro bono.
At the end of the book it is revealed that the reason Anna initiated the lawsuit was because her sister didn’t want her to donate the kidney. After the trial she is granted medical emancipation but, just as Anna is about to reveal her decision if she wants to give Kate her kidney or not, she becomes brain dead unexpectedly of a closed-head injury suffered in a car crash. As Campbell Alexander has power of attorney over Anna’s medical decisions he grants the use of Anna’s kidney for her sister Kate. In the epilogue of the book we see that Kate survived the transplant, even though the doctors thought she might be too weak to survive. Kate believes that the reason she survived is because Anna took her place in heaven.