From Jonathan Weiner, Pulitzer Prize-winning author of The Beak of the Finch, comes His Brother's Keeper -- the story of a young entrepreneur who gambles on the risky science of gene therapy to try to save his brother's life. Stephen Heywood was twenty-nine years old when he learned that he was dying of ALS -- Lou Gehrig's disease. Almost overnight his older brother, Jamie, turned himself into a genetic engineer in a quixotic race to cure...