„Un peuple et son roi" crosses the destinies of the men and women of the population, and those of historical figures. Their meeting place is the newly founded National Assembly. At the heart of the story lie the fate of the king and the birth of the French Republic.

César Casalonga wins a France presidential election primary for his party. But that victory was rigged. Helped by Paul Francoeur and Marylin, before the press or his opponents find out, César Casalonga must disentangle the conspiracy.