"Diana" is one of the most famous novels of the American writer Susan Warner. This book is a classic example of a 19th century American romantic novel. The plot is based on the story of a young American woman who finds herself in aristocratic English society. The tension between freedom and traditions, between the heart and the mind, causes deep reflection in the readers. The book "Diana" still remains an important work that reveals the social and psychological aspects of life in the 19th century and impresses with its relevance and uniqueness.