The Four Musketeers pursue Vorontsov until he finally arrives in St. Petersburg. Here D’Eon attempts to gain permission from Empress Elizabeta to operate in Russia.

Robespierre captures and interrogates Durand; D’Eon and the others attempt to rescue him.

Saint-Germain tries to win Queen Marie over to his cause, which she refuses and they fight. Later, Broglie and the King prepare to kill the Queen.