The book "Unloving Woman: A Social Mystery" by the famous American writer Horatio Alger, Jr. tells the story of a mysterious woman who shocked society with her coldness and unusual attitude towards others. With the help of bright landscapes and complicated relationships of the characters, the author reveals the subtleties of social relationships and the psychology of the characters. "Not a loving woman" is not only a detective story, but also an in-depth analysis of society and human relations.