Sin is out of fashion while fascination with our own inner workings is everywhere. But in his new book Stephen Cherry says that the concept of sin is an essential, and healthy, tool for self understanding. Stephen Cherry is the Dean of King’s College, Cambridge, and the author of many books including Healing Agony: Re imagining Forgiveness and The Dark Side of the Soul: An Insider’s Guide to the Web of Sin (Bloomsbury 2012 and 2016). 5 March 2017.