As a medical student, Farmer found his life's calling: to cure infectious diseases and to bring the lifesaving tools of modern medicine - so readily available in the developed world - to those who need them most. Beginning in Haiti, he tackles the conditions that contribute to so many unnecessary deaths with his trademark combination of world-class expertise, unlimited compassion, and the unstinting dedication of friends and colleagues. Tracy Kidder's magnificent and moving account shows how, from achieving this modest dream, one person can make a difference in solving global problems through a clear-eyed understanding of the interaction of politics, wealth, social systems and medicine.