Marsh is a British brain surgeon and part of his aim in this book is to talk about his mistakes as well as his successes. As you can imagine, there is very little room for error in brain surgery. He admits his own amazement, looking down into the patient's brain, and realizing that is where thought originates and makes us who we are. Marsh considers neurosurgery to be more of a craft than an exact science, and when he pulls out the drills and saws, we understand his point. There were times when I had to set the book aside for a while, because the surgery descriptions are graphic and intense. Ultimately, this book is a profile of a man, who courageously cuts into the brains of patients in an attempt to give them a few more years of life, or the ability to live without seizures. He must guide the patient toward the correct decision, because sometimes surgery is not always the best option. Sometimes it's just too late. This book is one of my favorite books of 2015.