The document summarizes chapter 6 of the book "Crisis Intervention: The Criminal Justice Response to Chaos, Mayhem, and Disaster" by William Harmening. The chapter discusses suicide and the psychology of self-destruction. It covers the social impact of suicide in America, predominant theories of suicide, a typology scheme for different types of suicide and the dangers they pose, and techniques for responding to and de-escalating suicide situations. The chapter objectives are to summarize these topics.