What is this book called?

I read this book a few months ago, but I can't remember the title. I wanted to read it again. It's about a 13 year old girl named Anna who was only born to be a doner for her sister Kate, who is 16 and has leukemia. She sued her parents for the right to her body so she didn't have to donate a kidney to... show more I read this book a few months ago, but I can't remember the title. I wanted to read it again. It's about a 13 year old girl named Anna who was only born to be a doner for her sister Kate, who is 16 and has leukemia. She sued her parents for the right to her body so she didn't have to donate a kidney to her sister.
Also, who was it by?
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