What's Bred in the Bone by Grant Allen

For Mr. Montague Nevitt was a cautious, cool, and calculating person. He knew, better than most of us that knowledge is power. So when the manager mentioned to him casually in the way of business the names of Guy and Cyril Waring, Mr. Montague Nevitt didn't respond at once, "Oh, dear yes; one of them's my most intimate personal friend, and the other's his brother," as a man of less discretion might have been tempted to do. For, in the first place, by finding out, or seeming to find out, the facts about the Warings that very afternoon, he could increase his character with his employers for zeal and ability. And, in the second place, if he had let out too soon that he knew the Warings personally, he might most likely on that very account have been no further employed in carrying into execution this delicate little piece of family business.

So Nevitt held his peace discreetly, like a wise man that he was, and answered merely, in a most submissive voice, "I'll do my best to ascertain where they bank, at once," as if he had never before in his life heard the name of Waring.