It has been ten years since Juliette de Marny's father asked her to swear revenge upon Deroulede for the death of her brother in a duel At last she finds herself in Deroulede's house with an easy opportunity to betray him to the Citizens of France for conspiring against the people Juliette realizes, too late, that she is in love with Deroulede Can the Scarlet Pimpernel rescue Deroulede from certain death by guillotine? Will Deroulede forgive Juliette for her betrayal of him?