I probably learned something about finance and munitions, though those subjects always make my eyes glaze over. I didn't like it as much as I thought I would, from what I'd heard about it. Elizabeth (John Stone's widow) was a great character, but she was the only one who really came to life for me. I liked the Russian doll structure of the book, going back in time with each narrative revealing more about the central event, Stone's death in a fall from a window. However, the voices of the three narrators were virtually identical, and there wasn't much distinction between them as characters.