Andrew Mearns, a late 19th-century social reformer and author, is best known for his pivotal work “The Bitter Cry of Outcast London”, an eye-opening exposé on the dire living conditions of the urban poor in London. Mearns, a clergyman with the Free Church of Scotland, directed his efforts towards highlighting the grave social injustices of his time. His 1883 pamphlet illuminated the squalid and overcrowded tenements of the London slums, stirring the public and policy-makers alike. The evocative detailing in “The Bitter Cry” painted a vivid picture of the destitution and sparked an urgency for housing reforms, arguably resulting in the eventual development of social housing policies in the UK. Mearns”s literary style is marked by his direct and impassioned prose, which not only captured the grim reality but also stirred a moral imperative to address the inhuman conditions endured by the marginalized communities. His work stands as a testament to Victorian investigative journalism and social advocacy, echoing the voices of those who were unheard in the corridors of power. Mearns”s contribution to social reform through his writing has carved out a prominent place for him in the annals of social justice literature.