"The Adventure of the Greek Interpreter", one of the 56 Sherlock Holmes short stories written by Sir Arthur Conan Doyle, is one of 12 stories in the cycle collected as The Memoirs of Sherlock Holmes. The story was originally published in The Strand Magazine (UK) and Harper's Weekly (US) in September 1893. This story introduces Holmes's elder brother Mycroft. Doyle ranked "The Greek Interpreter" seventeenth in a list of his nineteen favourite Sherlock Holmes stories.
Plot
On a summer evening, while engaged in an aimless conversation that has come round to the topic of hereditary attributes, Doctor Watson learns that Sherlock Holmes, far from being a one-off in his powers of observation and deductive reasoning, in fact has an elder brother whose skills, or so Holmes claims, outstrip even his own. As a consequence of this, Watson becomes acquainted with the Diogenes Club and his friend's brother, Mycroft.

Mycroft, as Watson learns, does not have the energy of his younger brother and as a consequence is incapable of using his great skills for detective work:

In spite of his inertia, the elder Holmes has often delivered the correct answer to a problem that Sherlock has brought to him. On this occasion, however, it is Mycroft who has need to consult Sherlock. Mr. Melas, a Greek interpreter and neighbour of Mycroft, tells of a rather unnerving experience he has recently gone through.

Melas was called upon one evening by a man named Harold Latimer to go to a house, supposedly in Kensington, to translate on a business matter. On the way there in Latimer's coach, Melas noticed that the windows were papered over so that he could not see where he was. Latimer also produced a bludgeon, laying it beside him as an implied threat. Melas protested, saying that what Latimer was doing was unlawful. The kidnapper replied that he would make it up to Melas, but also threatened him with unspecified retribution should the evening's business ever be made public.
For approximately two hours they drove, at last arriving at a house. It was dark, and Melas got only a general impression of a large property as he was hustled out of the coach and into the house. The house itself was poorly lit, but Melas made out that it was quite big. In the room into which he was led by Latimer and another, nervous, giggling gentleman—whose name is later discovered to be Wilson Kemp—Melas noticed a deep-pile carpet, a high marble mantel, and a suit of Japanese armour.
Another man was brought into the room. He was thin and emaciated and had sticking plaster all over his face, and a bandage sealing his mouth. Melas knew then that things were not right. Melas was sly enough to observe that his kidnappers were utterly ignorant of Greek, and used this to find out some information. While Latimer and his giggling companion had Melas translate demands that this man sign some papers, Melas added his own short questions to the dialogue. The man not only answered Latimer that he would never sign these papers, but he also answered Melas that his name was Kratides, that he had been in London for three weeks, that he had no idea what house he was in, and that his captors at the house were starving him. He wrote all his answers, unable as he was to speak through the sticking plaster.
Much could be inferred from Kratides's answers to Latimer, too. Evidently, Latimer was trying to coerce Kratides into signing over property to him, and a woman was also involved. Latimer had warned Kratides that his obstinacy would do her no good.
Melas would have extracted the whole story from this stranger had the woman herself not burst in unexpectedly, but even that event furnished new information. She recognised Kratides as "Paul", whereupon he managed to get the bandage off his mouth and he called her "Sophy". They both behaved as though neither had expected to see the other.
Melas was ushered back into the coach for another interminable ride and was deposited far from his home on Wandsworth Common. He made it to Clapham Junction just in time for the last train to Victoria. He has now presented his story at the Diogenes Club to Mycroft, who asks his brother Sherlock to look into it.





