The events of Ninety-Three occur during (and somewhat define) the period of the French Revolution. For this reason, all the characters' actions are tremendously important. The fate of a large part of the world literally hangs on their actions. Toward the end of the book, during the battle at La Tourgue, you can almost see the future itself, balanced on a knife-edge, swaying back and forth with the actions of the main characters.

The characters in Ninety-Three are giants among men. Lantenac, Gauvain, Cimourdain - all are heroic in their own way. Even minor characters like Radoub the soldier, Tellmarch the beggar, and Halmalo the sailor are honorable and admirable people.

There are scenes in Ninety-Three that are among the best read anywhere. (The "loose cannon" on the Claymore and the fire at La Tourgue being good examples.