Introduction A Brief History of Criminal Investigation Criminal Investigation and Victims Strategic Phase One: Instigation and Initial Response Initial Response and Crime Scene Lockdown Crime Scene Examiners Strategic Phase Two: The Investigation Investigative Strategy Forensic Science Specialisms: Palynology, Entomology and DNA Electronic and Passive Data Suspect Prioritisation, Behavioural Analysis and Profiling Interviewing Victims and Witnesses Suspect Interviews Strategic Phase Three: Case Management Case Files Case Reviews