I just finished reading Clementine: The Life of Mrs. Winston Churchill by Sonia Purnell.
Clementine Churchill lived an amazing life. She was incredibly under appreciated, both in her time, and now. I feel like I know a fair amount about Eleanor Roosevelt who was an incredible advocate. Clementine Churchill may well have done more for Britain (and the free world) than Eleanor, but has received almost no credit.
Born into impoverished nobility, she was about a decade younger than Winston Churchill. This book draws heavily from the copious correspondence between Winston and Clementine. They were generally not model parents, and the book does not sugar coat their shortcomings in this area. Clementine was privy to most of what Winston dealt with (including state secrets). She advised and challenged Winston, and was often the only one who could challenge him. She tempered him in many ways, and often re-wrote speeches and memos.
For a book where you know how it will end (there are no secrets about history), it was a gripping read. I even pushed it ahead of other books on my "to read" pile.