Algiers (Arabic: الجزائر‎, al-Jazā’ir; Algerian Arabic: دزاير, Berber: Dzayer / ⴷⵣⴰⵢⴻⵔ) is the capital and largest city of Algeria. According to the 1998 census, the population of the city proper was 1,519,570 and that of the urban agglomeration was 2,135,630. In 2009, the population was about 3,500,000. An estimate puts the population at about 3,574,000 as of 2010.

Called El-Behdja (البهجة) or alternatively Alger la Blanche ("Algiers the White") for the glistening white of its buildings as seen rising up from the sea, Algiers is situated on the west side of a bay of the Mediterranean Sea. The modern part of the city is built on the level ground by the seashore; the old part, the ancient city of the deys, climbs the steep hill behind the modern town and is crowned by the casbah or citadel, 122 metres (400 ft) above the sea. The casbah and the two quays form a triangle.

The city name is derived (via French Alger and Catalan Alger) from the Arabic name الجزائر al-Jazā’ir, which translates as "The Islands", referring to the four islands which lay off the city's coast until becoming part of the mainland in 1525. Al-Jazā’ir is itself a truncated form of the city's older name جزائر بني مازغان Jazā’ir Banī Mazghannā, "The Islands of the Sons of Mazghanna", used by early medieval geographers such as al-Idrisi and Yaqut al-Hamawi.

Sherlock Holmes ( /ˈʃɜrlɒk ˈhoʊmz/) is a fictional detective created by Scottish author and physician Sir Arthur Conan Doyle. The fantastic London-based "consulting detective", Holmes is famous for his astute logical reasoning, his ability to adopt almost any disguise, and his use of forensic science skills to solve difficult cases.

Holmes, who first appeared in publication in 1887, was featured in four novels and 56 short stories. The first novel, A Study in Scarlet, appeared in Beeton's Christmas Annual in 1887 and the second, The Sign of the Four, in Lippincott's Monthly Magazine in 1890. The character grew tremendously in popularity with the first series of short stories in Strand Magazine, beginning with A Scandal in Bohemia in 1891; further series of short stories and two novels published in serial form appeared between then and 1927. The stories cover a period from around 1880 up to 1914.

All but four stories are narrated by Holmes's friend and biographer, Dr. John H. Watson; two are narrated by Holmes himself ("The Blanched Soldier" and "The Lion's Mane") and two others are written in the third person ("The Mazarin Stone" and "His Last Bow"). In two stories ("The Musgrave Ritual" and "The Gloria Scott"), Holmes tells Watson the main story from his memories, while Watson becomes the narrator of the frame story. The first and fourth novels, A Study in Scarlet and The Valley of Fear, each include a long interval of omniscient narration recounting events unknown to either Holmes or Watson.