What is the relevance of morality today? Eden Collinsworth enlists the famous, the infamous, and the heretofore unheard-of to unravel how we make moral choices in an increasingly complex--and ethically flexible--age.

To call these unsettling times is an understatement: our political leaders are less and less respectable; in the realm of business, cheating, lying, and stealing are hazily defined; and in daily life, rapidly changing technology offers permission to act in ways inconceivable without it. Yet somehow, this hasn't quite led to a complete free-for-all--people still...