Larson explains that he was inspired to write the book after reflecting on how the September 11, 2001 attacks affected New Yorkers. He drew a parallel with London during the Blitz (the German aerial assault of 1940-41) and in particular the reactions of Prime Minister Winston Churchill. He decided to focus on Churchill’s first year as prime minister, 1940-41, which coincided with the Blitz and formed the public image of Churchill as a strong leader and colorful personality. This will be an intimate biography that explains how Churchill and his circle of family, friends, and associates survived on a daily basis. Every quote and many descriptions come directly from historical documents.

In an introductory chapter, “Bleak Expectations,” Larson sets the stage for his historical account. Britain enters the war fully expecting the possibility of violence and bloodshed, including on civilians. However, Britain’s military leaders see the war through the lens of World War I. Since then, bombs and other weapons have grown larger and deadlier. Preparations begin in earnest after Britain declares war against Germany on September 3, 1939. The government issues a pamphlet to citizens instructing them what to do in case of attack.