¿Puede un padre o una madre amar demasiado? ¿O es que acaso tanto amor nunca es suficiente? Anna Fitzgerald no está enferma, aunque pudiera parecerlo. Con apenas trece años de edad ha soportado innumerables operaciones, inyecciones y transfusiones para que su hermana mayor Kate pueda de alguna manera sobrevivir a la leucemia que la aqueja desde su niñez. Anna, al ser genéticamente compatible con su hermana, fue la candidata idónea para ser la donante del transplante de médula de Kate, asumiendo así un papel que nunca cuestionaría sino hasta ahora. Como la mayoría de los adolescentes, Anna está comenzando a plantearse quién realmente es. Pero a diferencia de los demás, ella siempre ha sido definida en función de Kate. Es ahora cuando Anna toma una decisión que ante los ojos del mundo no es más que impensable, una decisión que desgarrará a su familia, atrayendo quizá fatales consecuencias para su hermana a la que tanto ama. Se trata de una provocadora novela que presenta una serie de planteamientos éticos importantes. Por la vida de mi hermana no es solamente la historia familiar de la lucha por sobrevivir sino una contemporánea parábola moral. "Hermosamente elaborada, esta novela atrapará a sus lectores de un solo golpe." -- Revista People "Posee la tenacidad emocional suficiente para temer a las lágrimas y al qué dirán." -- Periódico Daily News (New York) "Lleno de introspección, inspiración y desengaño. El tratamiento que Picoult hace del tema central es realmente impecable." -- Periódico San José Mercury News Jodi Picoult received an AB in creative writing from Princeton and a master’s degree in education from Harvard. The recipient of the 2003 New England Book Award for her entire body of work, she is the author of twenty-seven novels, including the #1 New York Times bestsellers House Rules , Handle With Care , Change of Heart , and My Sister’s Keeper , for which she received the American Library Association’s Margaret A. Edwards Award. She lives in New Hampshire with her husband and three children. Visit her website at JodiPicoult.com. Chapter One: Anna When I was little, the great mystery to me wasn't how babies were made, but why . The mechanics I understood -- my older brother Jesse had filled me in -- although at the time I was sure he'd heard half of it wrong. Other kids my age were busy looking up the words penis and vagina in the classroom dictionary when the teacher had her back turned, but I paid attention to different details. Like why some mothers only had one child, while other families seemed to multiply before your eyes. Or how the new girl in school, Sedona, told anyone who'd listen that she was named for the place where her parents were vacationing when they made her ( "Good thing they weren't staying in Jersey City," my father used to say). Now that I am thirteen, these distinctions are only more complicated: the eighth-grader who dropped out of school because she got into trouble; a neighbor who got herself pregnant in the hopes it would keep her husband from filing for divorce. I'm telling you, if aliens landed on earth today and took a good hard look at why babies get born, they'd conclude that most people have children by accident, or because they drink too much on a certain night, or because birth control isn't one hundred percent, or for a thousand other reasons that really aren't very flattering. On the other hand, I was born for a very specific purpose. I wasn't the result of a cheap bottle of wine or a full moon or the heat of the moment. I was born because a scientist managed to hook up my mother's eggs and my father's sperm to create a specific combination of precious genetic material. In fact, when Jesse told me how babies get made and I, the great disbeliever, decided to ask my parents the truth, I got more than I bargained for. They sat me down and told me all the usual stuff, of course -- but they also explained that they chose little embryonic me, specifically, because I could save my sister, Kate. "We loved you even more," my mother made sure to say, "because we knew what exactly we were getting." It made me wonder, though, what would have happened if Kate had been healthy. Chances are, I'd still be floating up in Heaven or wherever, waiting to be attached to a body to spend some time on Earth. Certainly I would not be part of this family. See, unlike the rest of the free world, I didn't get here by accident. And if your parents have you for a reason, then that reason better exist. Because once it's gone, so are you. Pawnshops may be full of junk, but they're also a breeding ground for stories, if you ask me, not that you did. What happened to make a person trade in the Never Before Worn Diamond Solitaire? Who needed money so badly they'd sell a teddy bear missing an eye? As I walk up to the counter, I wonder if someone will look at the locket I'm about to give up, and ask these same questions. The man at the cas