She knew, too, that when Sir Percy realized that his own plans and his directions to his lieutenants had been stolen by Chauvelin, it was too late to communicate with Armand, or to send fresh instructions to the fugitives.
They would, of necessity, be at the appointed time and place, not knowing how grave was the danger which now awaited their brave rescuer.
Blakeney, who as usual had planned and organized the whole expedition, would not allow any of his younger comrades to run the risk of almost certain capture.

Hence his hurried note to them at Lord Grenville's ball--"Start myself to-morrow--alone." And now with his identity known to his most bitter enemy, his every step would be dogged, the moment he set foot in France.

He would be tracked by Chauvelin's emissaries, followed until he reached that mysterious hut where the fugitives were waiting for him, and there the trap would be closed on him and on them.
There was but one hour--the hour's start which Marguerite and Sir Andrew had of their enemy--in which to warn Percy of the imminence of his danger, and to persuade him to give up the foolhardy expedition, which could only end in his own death.
But there WAS that one hour.
"Chauvelin knows of this inn, from the papers he stole," said Sir Andrew, earnestly, "and on landing will make straight for it." "He has not landed yet," she said, "we have an hour's start on him, and Percy will be here directly.

We shall be mid-Channel ere Chauvelin has realised that we have slipped through his fingers." She spoke excitedly and eagerly, wishing to infuse into her young friend some of that buoyant hope which still clung to her heart.

But he shook his head sadly.
"Silent again, Sir Andrew ?" she said with some impatience.