She meant to do or die, with him and for his sake.

A frown, which spoke of an iron will and unbending resolution, appeared between the two straight brows; already her plans were formed.

She would go and find Sir Andrew Ffoulkes first; he was Percy's best friend, and Marguerite remembered, with a thrill, with what blind enthusiasm the young man always spoke of his mysterious leader.
He would help her where she needed help; her coach was ready.

A change of raiment, and a farewell to little Suzanne, and she could be on her way.
Without haste, but without hesitation, she walked quietly into the house..