&;Highly eloquent, fascinating and deeply compassionate&; Henry Marsh We cannot know how to fix a problem until we understand its causes. But even for some of the most common mental health problems, specialists argue over whether the answers lie in the person&;s biology, their psychology or their circumstances. As a cognitive neuropsychiatrist, Anthony David brings together many fields of enquiry, from social and cognitive psychology to neurology. The key for each patient might be anything from a traumatic memory to a chemical imbalance, an unhealthy way of thinking or a hidden tumour. Patrick believes he is dead. Jennifer's schizophrenia medication helped with her voices but did it cause Parkinson&;s? Emma is in a coma &; or is she just refusing to respond? Drawing from Professor David&;s career as a clinician and academic, these fascinating case studies reveal the unique complexity of the human mind, stretching the limits of our understanding.