Catherine is in a final quarrel with her crowned husband. There is already an order for her arrest. Not wanting to cause a new outburst of anger, Catherine goes to Peterhof. Meanwhile, everything in the city is ready for a revolution. Peter III learns about his wife's escape. He is amazed by what happened and hesitates for a long time, not knowing what to do, but in the end he sails to Kronstadt. The conspirators also remember the naval citadel. Admiral Talyzin sails to Kronstadt, and Catherine gives Potemkin to help him. They manage to arrest the emperor's emissary and the commandant and swear in the naval crews. Unhappy Peter III is forced to return to Oranienbaum and surrender to the mercy of Catherine, who has already launched a campaign against him... “Coup” is the third novel in the series dedicated to the youth of Catherine the Great.