1. The Duchess of Montpensier meets the fanatical young monk, Jacques Clement. 2. She receives a message telling of the murder of her brother. 3. Henry of Navarre overhears the duchess incite Clement to kill Henry III. 4. Henry III is depressed because of the plot against him. 5. The Duchess of Montpensier threatens Henry III with vengeance. 6. The king prepares against an attack. 7. Henry of Navarre advises the king to flee. 8. Partisans of the duchess storm the castle. 9. Clement receives the message, "It is time to act." 10. Henry III designates Henry of Navarre as his successor.