Answered in example sentence
"Surely, sir," cried the father, losing sight of delicacy in apprehension for his child, "you will keep secret the discovery which your being in my house has enabled you to make?"Harper turned quickly to the speaker, and then, losing the sternness which had begun to gather on his countenance, he answered mildly, "I have learned nothing in your family, sir, of which I was ignorant before; but your son is safer from my knowledge of his visit than he would be without it."