Written for non-specialists, this concise and accessible work by moral philosopher Kevin L. Flannery engages in a careful reflection of the moral issues of greatest importance in the lives of Christians today. After introductory chapters on the relationship between ethics and church teaching, and on the relevance of action theorythe study of the nature and structure of human actionsFlannery applies Aristotles and Thomas Aquinass theory of human action to the following topics: sexual morality, reproduction, killing and keeping alive, cooperation in the evil acts of others, and conscience.