Mr Sidney Johnson

Senior clerk and draughtsman at the Woolwich Arsenal.
"He is a man of forty, married, with five children. He is a silent, morose man, but he has, on the whole, an excellent record in the public service. He is unpopular with his colleagues, but a hard worker." (Mycroft Holmes)

He was a thin, gruff, bespectacled man of middle age, his cheeks haggard, and his hands twitching from the nervous strain to which he had been subjected.