Baron Trigault's Vengeance by Emile Gaboriau

It was not enough to tell M. Wilkie the secret of his birth. He must be taught how to utilize the knowledge. The Viscount de Coralth devoted himself to this task, and burdened Wilkie with such a host of injunctions, that it was quite evident he had but a poor opinion of his pupil's sagacity. "That woman d'Argeles," he thought, "is as sharp as steel. She will deceive this young idiot completely, if I don't warn him."

So he did warn him; and Wilkie was instructed exactly what to do and say, how to answer any questions, and what position to take up according to circumstances. Moreover, he was especially enjoined to distrust tears, and not to let himself be put out of countenance by haughty airs. The Viscount spent at least an hour in giving explanations and advice, to the great disgust of M. Wilkie, who, feeling that he was being treated like a child, somewhat testily declared that he was no fool, and that he knew how to take care of himself as well as any one else. Still, this did not prevent M. de Coralth from persisting in his instructions until he was persuaded that he had prepared his pupil for all possible emergencies. He then rose to depart. "That's all, I think," he remarked, with a shade of uneasiness. "I've traced the plan -- you must execute it, and keep cool, or the game's lost."