Book excerpt: The Routledge International Handbook of Legal and Investigative Psychology explores contemporary topics in psychological science, applying them to investigative and legal procedures. Written by recognized scholars from around the globe, this book brings together current research, emerging trends, and cutting-edge debates in a single comprehensive and authoritative volume. Drawing from both research and practice, this handbook highlights many important issues such as: how to investigate and prosecute rape; the value of emotional affect in homicide investigations; and factors affecting jurors’ and suspects’ decision making. By considering current research, the authors inform both legal and investigative professionals of findings that are of direct relevance to them, and the steps that can be taken to improve efficiency. This collection will inform investigative and legal professionals, advanced psychology students, academics, researchers, and policy makers. It will also be of great interest to researchers from other disciplines, including criminology, policing, and law.