This was a bit of a struggle to get through; Manby Smith shares Dickens's weakness for using ten words where one would suffice. It conveys an interesting account of mid Victorian London which clearly had an active "unofficial" economy akin to many Indian and African cities today. As a general read it is now rather turgid and past its sell by date.
It's interesting and available on Gutenberg. It is very tedious to read as the author writes a paragraph or two where a sentence would do. but it is a good reminder of how 19th century London was not a pleasant time, even if you were rich and a horrible place if you weren't rich