From Reasons to Norms - On the Basic Question in Ethics

The author mainly concerns himself with particular aspects of these problems: Which are the problems of morality? Are there many different moral questions, or, do they all, in the final analysis, reduce to one? The bold claim made in this book is that there is just one: What ought to be done? Moreover, there is just one source of normativity, just one kind of 'ought'-question, which lends itself to an objectively correct and authoritative answer.