Nicholas Rescher 
Philosophical Primer on Ethics and Morality [PDF ebook] 

This book provides a comprehensive overview of ethics and morality, providing an account of what the field is about, what its demands are, and setting out the rationale for its injunctions. As a primer, it serves as an introduction to the realm of ethics and morality, and seeks to present an overview of essentials of this all-important human enterprise. Without itself being contentious, it provides a comprehensive account of what the contentions are about.