Imagine you are a patient, about to undergo brain surgery. If it goes well it will save your life; if it goes wrong you could end up paralysed or dead. Of course you want to believe your surgeon is infallible, a superhero - but he is not; he is all too human just like you. That simple truth emerges from the extraordinarily honest writing of one of Britain's leading brain surgeons, Henry Marsh. He gives rare insight into the mind of the doctor - is it reassuring or troubling?