Individuals suffering from psychiatric or substance abuse disorders sometimes display any one of a number of frightening behaviors: verbal outbursts, physical threats and even violence. Police officers must deal with such individu- als on a frequent basis. In this comprehensive guidebook, Ellis Amdur and John Hutchings offer law enforcement officers a comprehensive set of strategies to keep themselves as well as the general public safe, while functioning at the highest level of professionalism. The first section of this book is tactical: everything from field safety and strategic planning on one side, to honing your intuition to pick up early signs of danger on the other. In the second section of the book, the authors focus on us: what we can do to achieve a state of integrity and powerful calm. Rather than abstract pronouncements, they offer specific strategies, including a method of breathing for the purpose of maintaining one’s own center in crisis situations. They then move on to the heart of the book, discussing specific behaviors ranging from confu- sion and obsessive concerns to psychosis, mania and acute disorganization. In one very impor- tant section, they discuss interactions with opportunistic and manipulative individuals (at worst, those referred to as psychopaths), people who present a danger to the psychological and physical well-being of anyone with whom they come in contact. Amdur and Hutchings do not merely confine themselves to the important subject of despon- dent suicidal individuals who attempt to kill themselves. They also offer strategic interventions for “parasuicidal” individuals, those who either threaten to harm themselves, or repetitively do so, requiring almost constant involvement of police, hospitals and the mental health system. In one very important chapter, the authors discuss “suicide-by-cop,” where self-harm and interper- sonal aggression are folded into the same act. They then move on to a discussion of anger and potentially violent behavior, whether directed at law enforcement officers or others. The authors give succinct information on how to imme- diately recognize different modes of aggression, whether displayed by adults, youth, or children, and then outline how to quickly and effectively implement de-escalation or control tactics best suited to deal with the type of aggression one is facing. Rather than abstract information, more useful in a consulting room than on the street, The Thin Blue Lifeline is tactically based, from start to finish. This book can function as the foundation of any law enforcement Crisis Intervention Team program, providing a comprehensive course of study of “boots-on-the-ground” encounters with emotionally disturbed individuals. In the same vein, the information in this volume provides core information on communication, which will be invaluable to any crisis/hostage negotiation team.