The Invisible Censor by Francis Hackett is a philosophical treatise that explores the concept of censorship and its impact on society. The author analyzes various forms of censorship - from open suppression of freedom of speech to hidden or self-censorship. The book offers a deep reflection on the importance of freedom of expression and the limitations that can accompany this right. With its in-depth analysis and clear writing style, The Invisible Censor will be an interesting resource for anyone interested in issues of censorship, freedom of speech, and public debate.