Complications: A Surgeon's Notes on an Imperfect Science by Atul Gawande
This is a stunningly well-written account of the life of a surgeon: what it is like to cut into people's bodies and the terrifying - literally life and death - decisions that have to be made.There are accounts of operations that go wrong; of doctors who go to the bad; why autopsies are necessary; what it feels like to insert your knife into someone.