Murder 38 Investigation 27 Police 24 History 10 Private investigators 8 Sheriffs 5 Crimes against 4 more ... Criminal investigation 4 Organized crime 4 Police chiefs 4 Detective and mystery stories, Spanish 3 Psychoanalysts 3 Women detectives 3 Women private investigators 3 African American women 2 Assassins 2 Crime 2 Death 2 Ex-police officers 2 Homicide 2 Human trafficking 2 Jews 2 Missing persons 2 Photographers 2 Policewomen 2 Psychological aspects 2 Serial murders 2 Abduction 1 Adult child abuse victims 1 African American police 1 less ...