did he tell her or did she some how find out?
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One night, Lady Blakeney is peeking around her husband's study when she finds a ring emblazoned with the image of the Scarlet Pimpernel -- she discovers his true identity. And indeed, now she realizes she has betrayed her own husband to Chauvelin - and must make the choice between saving him and her brother.
did percy know he knew?
No, not at that moment.