Sue a Little Heroine by L.T. Meade

Pickles and Sue had to go a long way before they reached the destination of "the best little woman in the world. " They walked along by-streets and all kinds of queer places, and presently reached a part of London where Sue had never been before. They passed whole streets of warehouses, and came then to poor-looking dwelling-houses, but all of an immense height, and very old and dirty. It was the back slums of Westminster over again, but it was a Westminster severed as far as one pole is from another to Sue.

"We does a roaring trade yere," said Pickles, looking around him with the air of a proprietor well satisfied with his property.