With chapters counting down the Bortle scale (9 to 1), this book examines levels of darkness in the world. Chapters discuss modern fallacies (light reduces crime!) and the real reasons (adding light is an easy win for politicians; utilities need to sell electricity at night). Some very good discussions of night in earlier cultures, some rambling travels with a lot of bad weather. Enjoyed the discussions from each chapter at the end, and plan to find a Bortle 1 class night next summer. Somewhere between 3.5 and 4 stars.