The book is a detailed examination of the living conditions of the poor in New York City in the late 19th century. It provides a vivid and often shocking account of life in the slums, tenements and sweatshops of the city, based on the author's own investigative journalism. The book had a significant impact on public opinion and led to changes in housing laws and social policy.

"The Battle with the Slum" is a historical documentation of the living conditions in the slums of New York City during the late 19th and early 20th century. The author, a social reformer and journalist, provides a detailed account of the overcrowded and unsanitary conditions that the city's poor were subjected to. The book also highlights the efforts of the government and philanthropists to improve these conditions and eradicate the slums, emphasizing the importance of housing reform and social welfare in urban development.

The novel follows the life of a young boy named Pelle and his father Lasse, who migrate to Denmark from Sweden in search of a better life. They find work on a large farm, where they are subjected to harsh conditions and exploitation by the upper classes. Despite the struggles and injustices he faces, Pelle is determined and optimistic, embodying the spirit of the working class and their fight for a dignified existence. His journey from a poor laborer to a self-made man is a testament to resilience and the pursuit of social justice, reflecting the broader labor movement of the time.