Where will you seek it? You can do one of two things: go to a big agency and secure the services of the _right man_, or engage such a man outside who may or may not be a professional detective. I have frequently utilized with success in peculiar and difficult cases the services of men whom I knew to be common-sense persons, with a natural taste for ferreting out mysteries, but who were not detectives at all. Your head book-keeper may have real talents in this direction—if he is not above using them. Naturally, the first essential is brains—and if you can give the time to the matter, your own head will probably be the best one for your purposes. If, then, you are willing to undertake the job yourself, all you need is some person or persons to carry out your instructions, and such are by no means difficult to find. I have had many a case run down by my own office force—clerks, lawyers, and stenographers, all taking a turn at it. Why not? Is the professional sleuth working on a fixed salary for a regular agency and doing a dozen different jobs each month as likely to bring to bear upon your own private problem as much intelligence as you yourself? There is no mystery about such work, except what the detective himself sees fit to enshroud it with. Most of us do detective work all the time without being conscious of it. Simply because the matter concerns the theft of a pearl, or the betraying of a business or professional secret, or the disappearance of a friend, the opinion of a stranger becomes no more valuable. And the chances are equal that the stranger will make a bungle of it. Many of the best available detectives are men who work by themselves without any permanent staff, and who have their own regular clients, generally law firms and corporations. Almost any attorney knows several such, and the chief advantage of employing one of them lies in the fact that you can learn just what their abilities are by personal experience. They usually command a high rate of remuneration, but deductive ability and resourcefulness are so rare that they are at a premium and can only be secured by paying it. These men are able, if necessary, to assume the character of a doctor, traveller, man-about-town, or business agent without wearing in their lapels a sign that they are detectives, and they will reason ahead of the other fellow and can sometimes calculate pretty closely what he will do. Twenty-five dollars a day will generally hire the best of them, and they are well worth it. The detective business swarms with men of doubtful honesty and morals, who are under a constant temptation to charge for services not rendered and expenses not incurred, who are accustomed to exaggeration if not to perjury, and who have neither the inclination nor the ability to do competent work.