A couple years ago I read some academic histories of the revolution, and as I made my way through this novel, I was glad I had done so. It was hard work getting into it, as each short chapter began a separate story told by a different character. Just as you're getting into it, it all changes. If I hadn't been vitally interested in the period I wouldn't have bothered. Also Piercy's prose style is not very elegant. The great strength of this book however is her passionate interest in each of the characters and the events they lived through.
Compared to the academic books, good as they were, in this book it is much easier to understand the importance of the respective roles played by Danton, Robespierre, Desmoulins and others, and why it was that at times they were allies and at others enemies. I can think of no political story - except perhaps the time of the Roman Republic - when the main players shifted alliances so rapidly. By writing each chapter from the viewpoint of each character in turn Pierce attempts to enter the world as it looked to each player, and this is a highly effective strategy for attempting to explain how things unfolded the way they did.
This is a novel but clearly Piercy has done her homework. If you want to understand how the French Revolution unfolded I would recommend this book very highly.