Just finished the new book "Nuclear War: A Scenario" by Annie Jacobsen. I would categorize this as 'hypothetical nonfiction' - a very odd category, but hear me out. It is clear that Jacobsen did her research - she interviewed a very wide range of people who have some kind of expertise in nuclear weapons, whether that be former government officials, or experts who helped create and refine these weapons. She interviewed people who have spent large parts of their careers trying to figure out how to formulate policies around the use of these weapons and who have gamed out nuclear war scenarios. To put a point on it, the scenario she presents in this book is based on the very well-informed opinions and expertise of a) people who have studied nuclear weapons and the consequences of their use and b) people who know the kinds of events and interactions that might transpire in the event of a nuclear attack. In other words, the scenario presented is plausible - it's not based on the imagination of Annie Jacobsen, but rather on informed opinions of people who have spent countless hours imagining what this would be like.
In a word, it's terrifying. She meant it to be. It reminded me of a quote from Dan Carlin's Hardcore History podcast that I'll never forget: