Answer:
When Percy returns to save Armand, Masrguerite discovers that everything is a plan to capture the Pimpernel.
Explanation:
This question is about "The Scarlet Pimpernel"
Percy is secretly the Scarlet Pimpernel who has saved French aristocrats from being killed by the guillotine. This is a dangerous job, which attracts many enemies and therefore, there are many powerful people who want to find Scarlet Pimpernel and make him pay for what he has done. In an attempt to capture him, Chauvelin blackmails Armand, luring him to save him. When Percy finds out that Armand is in danger, he immediately goes to save him. After his departure, his wife discovers that this is a plan to arrest him and tries to alert him.