At $6.98, this Whispersync deal is a little bit higher in price than the highest that I like to post. But the ratings are very high (4.5 stars, from 247 reviews at Amazon). And the book is very big--546 pages. And, I confess, the subject is one that personally fascinates me.
The Mantle of Command: FDR at War, 1941–1942. By Nigel Hamilton.
https://www.amazon.com/dp/B00E78ICVA.