A very enjoyable and quick read. I had been reading about the Yalta Conference between FDR, Stalin, and Churchill and wanted to know if Stalin had known about FDR's crippled condition. That line of inquiry led me to this book, a very informative and exhaustive account of FDR's life with polio. To be clear, if you are looking for a straight-up biography of FDR, this book IS NOT for you. There is next to nothing about his life before polio, and very little is said about his policies as president. This is a book that seeks to fill in the holes of the FDR narrative. As the author says, many biographers view FDR's polio as an episode that had a beginning, middle, and end in the 1920's, and not as something he dealt with his entire life, which was the reality.
Gallagher does a good job of filling in those holes. The chapters are arranged chronologically, but the author isn't afraid to jump around in time within the chapter if it serves the narrative. That being said, he IS painting a narrative. Gallagher is a polio himself, and while he writes as an objective historian, his agenda in writing cannot be denied. As such, there is a little bit of hero worship in the story. I don't think he does a very good job of accurately portraying Eleanor. He paints her as cold to Roosevelt, without really delving into why (i.e. Roosevelt's infidelity and infamous self-centeredness). That being said, this book is very enjoyable and has many fun, informative, and interesting anecdotes.
P.S. Yes, Stalin did know about Roosevelt's polio.