What were the lived realities and economic conditions of the impoverished working classes in mid-19th century London? Henry Mayhew, a pioneering social investigator and journalist, utilizes a combination of direct interviews, statistical analysis, and observational reporting to document the lives of those existing on the margins of Victorian society. His work serves as a foundational sociological inquiry, aiming to categorize the 'labour' and 'poor' into distinct groups based on their means of survival and social standing. By presenting these accounts in the subjects' own voices, Mayhew constructs a comprehensive portrait of urban inequality.

Historians and sociologists regard this work as a critical primary source for understanding the social stratification of Victorian London. Readers frequently note the dense, descriptive prose that provides an unparalleled window into the informal economy of the 1850s.