The film follows the life of Napoleon from his early life in Corsica to his death at Saint Helena. The film is notable for its use of location shooting for numerous scenes, especially at the French estates of Malmaison and Fontainebleau, the Palace of Versailles, and sites of Napoleonic battles including Austerlitz and Waterloo.

Witty narration follows the history of Versailles Palace; founded by Louis XIII, enlarged by autocratic Louis XIV, whose personal affairs and amours, and those of his two successors, are pursued in more detail to the start of the Revolution, after which the story is brought rapidly up to date.

Four women were murdered, each was knifed and, though they had their clothes torn, they weren't molested. As the famed police inspector Jules Maigret pieces the clues together, he comes to realize that for the elusive man that he suspects to be unmasked, he has to set him a trap.