Never Surrender is set in May/June 1940, when Winston Churchill became Prime Minister of Britain, and also when the Germans launched their 'blitzkreig' on France, and the Low Countries.
While British, French, and Belgian troops are trying to fight the Germans, in London Churchill is trying to fight off politicians, who do not agree with his assessment of the war.
You get a real sense of dread, as the book progresses and the Nazis push the allies further and further back, and a real sense of doom emanating from the war rooms of London, as the news from the front gets progressively worse.
The author paints a very vivid picture of the desperate retreat of the British to Dunkirk, and in the scenes set in London you can almost feel that you are 'sitting in' on the Churchill's meetings with his civil servants and political foes. A highly enjoyable read.