The Black Gang by H.C. McNeile

Number 5, Green Street, Hoxton, was not a prepossessing abode. A notice on one of the dingy downstair windows announced that Mr. William Atkinson was prepared to advance money on suitable security: a visit during business hours revealed that this was no more than the truth, even if the appearance of Mr. Atkinson's minion caused the prospective borrower to wonder how he had acquired such an aggressively English name.

The second and third floors were apparently occupied by his staff, which seemed unduly large considering the locality and quality of his business. Hoxton is hardly in that part of London where large sums of money might be expected to change hands, and yet there was no doubt that Mr. William Atkinson's staff was both large and busy. So busy indeed were his clerks that frequently ten and eleven o'clock at night found them still working hard, though the actual business of the day downstairs concluded at six o'clock -- eight Saturdays.