Book excerpt: The author offers a look at depression in which he draws on his own battle with the illness and interviews with fellow sufferers, researchers, doctors, and others to assess the complexities of the disease, its causes and symptoms, and available therapies. This book examines depression in personal, cultural, and scientific terms. He confronts the challenge of defining the illness and describes the vast range of available medications, the efficacy of alternative treatments, and the impact the malady has on various demographic populations, around the world and throughout history. He also explores the thorny patch of moral and ethical questions posed by emerging biological explanations for mental illness. He takes readers on a journey into the most pervasive of family secrets and contributes to our understanding not only of mental illness but also of the human condition.