It's a little bit biography, a little bit leadership book. And, in trying to do both, it doesn't do either especially well.
Also, I didn't know much about BG before reading this, and I think that there's a good deal to respect about him. However, the people that Myra and Shelley reference are dated in the worst way possible. Maybe in 2004(?) it was commendable to cite Driscoll, Hybels, and Zacharias. Not so in 2025. I'd say there's no real reason to read this book.