If I am wrong, correct me.

What I have been told is that a man was found who was ready, in return for a certain sum paid down, to substitute his own son for the little Dauphin--to allow his son to take the chance of coming alive out of that predicament.

One can imagine that such a man could be found in France at that period." Monsieur de Gemosac turned, and looked at his companion with a sort of surprise.
"You speak as if in doubt, Monsieur Colville," he said, with a sudden assumption of that grand manner with which his father had faced the people on the Place de la Revolution--had taken a pinch of snuff in the shadow of the guillotine one sunny July day.

"You speak as if in doubt.
Such a man was found.

I have spoken with him: I, who speak to you.".