It was a fatal mistake of Juliana's to enlist Harry Jocelyn against the Countess de Saldar.

He engaged, still without any direct allusion to the real business, to move heaven and earth to undo all that he had done, and the Countess implied an engagement to do--what?
more than she intended to fulfil.
Ten minutes later she was alone with Caroline.
'Tie yourself to the Duke at the dinner,' she said, in the forcible phrase she could use when necessary.

'Don't let them scheme to separate you.

Never mind looks--do it!' Caroline, however, had her reasons for desiring to maintain appearances.
The Countess dashed at her hesitation.
'There is a plot to humiliate us in the most abominable way.

The whole family have sworn to make us blush publicly.