Samuel Kahn’s new book is a wonderful introduction to the most important recent developments in normative ethics. It accurately and insightfully explains the results of work that is at the cutting edge of moral philosophy today, but is fully accessible to the beginning student or interested layperson. Presenting these ethical theories as answers to specific practical issues both old (Why should I be moral? Is anything wrong with egoism?) and new (What we should be do about climate change? When, if ever, is it permissible to use performance enhancing drugs in sports?), Kahn allows the reader to see how practical dilemmas give rise to theoretical reflection and how theoretical reflection can guide our practice.