When neuroscientist Barbara Lipska's melanoma spread to her brain it started to play tricks on her. The expert on mental illness, who had spent a career trying to work out how the brain operates and what happens when it fails, experienced what it is like to go mad. She began to exhibit paranoia and schizophrenia-like symptoms. She became disinhibited, completely unaware of her inappropriate behaviour. She got lost driving home from work, a journey she did every day. She couldn't remember things that had just happened to her. Small details like what she was having for breakfast became an obsession, but she ignored the fact that she was about to die. And she remembers every moment with absolute clarity. Weaving the science of the mind and the biology of the brain into her personal story, this is a powerful account of what happens when the brain fails.