Elusive Isabel by Jacques Futrelle — Read

Just as it is one man's business to manufacture watches, and another man's business to peddle shoe-strings, so it was Mr. Campbell's business to know things. He was a human card index, a governmental ready reference posted to the minute and backed by all the tremendous resources of a nation. From the little office in the Secret Service Bureau, where he sat day after day, radiating threads connected with the huge outer world, and enabled him to keep a firm hand on the diplomatic and departmental pulse of Washington. Perhaps he came nearer knowing everything that happened there than any other man living; and no man realized more perfectly than he just how little of all of it he did know.

In person Mr. Campbell was not unlike a retired grocer who had shaken the butter and eggs from his soul and settled back to enjoy a life of placid idleness. He was a little beyond middle age, pleasant of face, white of hair, and blessed with guileless blue eyes. His genius had no sparkle to it; it consisted solely of detail and system and indefatigability, coupled with a memory that was well nigh infallible. His brain was as serene and orderly as a cash register; one almost expected to hear it click.