The Further Adventures of Sherlock Holmes public." In which Holmes and Watson find themselves in unfamiliar but impressive surroundings and (in Holmes's case) in somewhat unusual but not at all unwelcome company. The detective gets a chance to use one of his less frequently aired foreign languages, the doctor gets the shock of his life, a policeman becomes a suspect, a brass band plays a part, and the safety of the Empire is secured by a remarkable bird... Additional cast First transmitted on 6 April 2010. The enigmatic Mycroft Holmes astonishes his brother as the shocking truth behind the mystery of the politician, the lighthouse and
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 The Special Detective Unit superseded the Special Branch (which they are still commonly referred to as), which itself replaced the older Criminal Investigation Department (CID), which was founded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