The widely acclaimed author of The New Black returns with this brilliant exploration of madness What separates the sane from the mad? How can we tell them apart? And what if the difference is really between being mad and going mad? In this landmark work Darian Leader undermines common conceptions of madness. Through case studies like the apparently 'normal' Harold Shipman, he shows that madness rarely conforms to standard models. And by exploring the idea of quiet madness - that at times many of us live interior lives that are far from sane but allow us to function normally and unthreateningly - he argues that we must seek a new way to assess, treat and deal with those suffering mental health problems.