This is one of the last books that I will read before The Chasseurs project is transitioned from a research project to a more proper blog about history and the Napoleonic Era (it's been in the works for long enough).
Alan Schom's book is brimming with excellent pieces and facts that are done in a very scholarly fashion. The quality of his details really rank up there with the best scholarship on this era. Gathering together the historical works on Napoleon would take a dozen blogs a dozen years; there's simply way too much that is way too good to ignore. There are hundreds of books written over a hundred years ago that are extremely valuable; Google Books is a good source for those.
What Schom does is follow the money and the trail of events. It's not enough to know what was happening when Napoleon landed in France after escaping Elba; he makes note of the messages that went back and forth between the panicked officials who were sensing, probably from the outset, that the new King of France, Louis XVIII, was simply going to run for the border (and, of course, he did).
It is an excellent read. I cannot proceed until I've finished it.