The Orange-Yellow Diamond by J.S. Fletcher

Two hours later, it being then a quarter-to-one o'clock, Purdie and Lauriston got out of a taxi-cab at the north-end of Tottenham Court Road and walked down the right-hand side of that busy thoroughfare, keeping apparently careless but really vigilant eyes open for a first glimpse of the appointed rendezvous. But Pilmansey's Tea Rooms required little searching out. In the midst of the big modern warehouses, chiefly given up to furniture and upholstery, there stood at that time a block of old property which was ancient even for London. The buildings were plainly early eighteenth century: old redbrick erections with narrow windows in the fronts and dormer windows in the high, sloping roofs. Some of them were already doomed to immediate dismantlement; the tenants had cleared out, there were hoardings raised to protect passers-by from falling masonry, and bills and posters on the threatened walls announced that during the rebuilding, business would be carried on as usual at some other specified address. But Pilmansey's, so far, remained untouched, and the two searchers saw that customers were going in and out, all unaware that before evening their favourite resort for a light mid-day meal would attain a fame and notoriety not at all promised by its very ordinary and commonplace exterior.

"An excellent example of the truth of the old saying that you should never judge by appearances, Andie, my man! " remarked Purdie, as they took a quick view of the place. "Who'd imagine that crime, dark secrets, and all the rest of it lies concealed behind this? -- behind the promise of tea and muffins, milk and buns! It's a queer world, this London! -- you never know what lies behind any single bit of the whole microcosm. But let's see what's to be seen inside."