Richard Joyce argues in this study that moral discourse is hopelessly flawed. At the heart of ordinary moral judgments is a notion of moral inescapability, or practical authority, which, upon investigation, cannot be reasonably defended. He asserts, moreover, that natural selection is to blame, in that it has provided us with a tendency to invest the world with values that it does not contain, and demands that it does not make. This original and innovative book will appeal to readers interested in the problems of moral philosophy.