TheNew York Timesbestseller from the author ofChasing the Scream, offering a radical new way of thinking about depression and anxiety.There was a mystery haunting award-winning investigative journalist Johann Hari. He was thirty-nine years old, and almost every year he had been alive, depression and anxiety had increased in Britain and across the Western world. Why?He had a very personal reason to ask this question. When he was a teenager, he had gone to his doctor and explai