If a book which is largely about the doctor's feelings as opposed to those of his patients, when the catastrophe happened to them rather than to him, annoys you on principle, don't read this. Personally, I liked knowing that there is at least one more doctor in the world who cares what happens to his patients, even if the caring is composed in equal parts of compassion, professional pride, and fear of being publicly shamed.
As that suggests, it's a memoir dedicated to saying how he really feels, whether that's elevated or petty. He spends quite a bit of time on justifiable raging over his hospital's incredibly terrible computer system, which keeps locking up the password so no one can see the scans they need to operate (hilariously, at one point some equally angry person sets the password to fuckyou47 (and then no one can remember if it's 47, 46, 45...), the lack of beds that mean that patients are deprived of food and water all day pending surgery and then the surgery gets canceled, and all the other myriad ways in which health care in England now sucks. (It still sounds about a million times better than health care in America.)
He talks frankly about his mistakes as a surgeon, some of which killed people. This is really a taboo topic, and my hat is off to him for going there.
There's also a lot of fascinating anecdotes about individual patients, and some beautiful writing about surgery, the physical structure of the brain, and the constant paradox of how that one squishy organ is the source of everything that makes us human and able to do things like write books, all of which is a source of wonder to him and one which he conveys very well.
It's definitely worth reading if the subject interests you, but it doesn't quite rise to the level of medical writing that I'd recommend whether the subject interests you or not. (My nominees for the latter are Atul Gawande, Oliver Sacks, and James Herriot.)
Do No Harm: Stories of Life, Death, and Brain Surgery