Murder 34 Investigation 25 Police 20 Private investigators 8 History 7 Sheriffs 5 Criminal investigation 4 more ... Police chiefs 4 Crimes against 3 Psychoanalysts 3 Women private investigators 3 African American women 2 Crime 2 Ex-police officers 2 Organized crime 2 Policewomen 2 Psychological aspects 2 Serial murders 2 Women detectives 2 Abduction 1 Adult child abuse victims 1 African American police 1 African Americans 1 Alleyn, Roderick (Fictitious character) 1 Ambulance drivers 1 Anarchists 1 Antiquities 1 Anxiety in children 1 Appleby, John, Sir (Fictitious character) 1 Arson 1 less ...