This book aims to demonstrate how forensic psychology contributes to police investigations, providing practical information about the type of reports provided by psychologists and behavioural advisors, and set within a broader theoretical context. It asks the question 'What do practitioners actually do when they provide advice for the police and the courts and how do they do it?' The contributors to the book are all experts in the field of offender profiling and behavioural investigative advice. The chapters provide valuable insights into particular case details, the ethical and legal consequences of advice, coverage of the relevant theoretical context, explanations for conclusions drawn, practical difficulties in preparing reports, potential pitfalls, and an account of how cases are resolved.