Armchair detective fan and bibliographer Allen J. Hubin." It was published from 1967 to 1997. Armchair detective An armchair detective is a fictional investigator who does not personally visit a crime scene or interview witnesses; instead, he or she either reads the story of the crime in a newspaper or has it recounted by another person. As the armchair detective never sees any of the investigation, the reader can attempt to solve the mystery on the same terms as the detective. The phrase possibly originates in a Sherlock Holmes story from 1893, "The Greek Interpreter", in which Holmes says of his brother
Special Detective Unit Special Detective Unit The Special Detective Unit (SDU) () is the main domestic security agency of the "Garda Síochána", the national police force of the Republic of Ireland, under the aegis of the Crime & Security Branch (CSB). It is the primary counter-terrorism and counter-espionage investigative unit within the state. The Special Detective Unit superseded the Special Branch (which they are still commonly referred to as), which itself replaced the older Criminal Investigation Department (CID), which was founded in 1921. They work in conjunction with the Defence Forces Directorate of Military Intelligence (G2) – the Republic of Ireland's national intelligence