"The Hidden Garden" is a novel that tells the story of a young girl named Mary Lennox, who discovers a neglected garden at her uncle's estate. After losing her parents, Mary is sent to live with her reclusive uncle, Archibald Craven. As she explores the estate, she finds the secret garden, which has been locked away for years. With the help of new friends, including Dickon and Colin Craven, Mary brings the garden back to life. The garden becomes a place of healing and transformation, not only for Mary but also for Colin, who learns to overcome his physical limitations. The story emphasizes themes of friendship, nature, and personal growth.