Among Charles Dickens novel, which one described the Underworld of London?

Oliver Twist, in full Oliver Twist; or, The Parish Boy’s Progress, novel by Charles Dickens, published serially under the pseudonym “Boz” from 1837 to 1839 in Bentley’s Miscellany and in a three-volume book in 1838. The novel was the first of the author’s works to realistically depict the impoverished London underworld and to illustrate his belief that poverty leads to crime. Source: britannica.com