"City of Joy" is a novel written by Dominique Lapierre, published in 1985. It tells the story of life in the slums of Kolkata, India, focusing on the struggles and resilience of its inhabitants. The book highlights the harsh realities of poverty while also showcasing the strength and hope of the human spirit. The title refers to the vibrant community spirit found in the slums, despite the challenges faced by the residents. The narrative is based on real-life experiences and emphasizes themes of friendship, love, and survival, making it a poignant exploration of life in one of the world's most densely populated cities.