Thus critical judgment has been formed, not on what the detective story can be and should be, but on what it too frequently was in the past when crudely and incompetently done. Unfortunately, this type of work is still prevalent; but it is not representative. In late years there has arisen a new school of writers who, taking the detective story seriously, have set a more exacting standard, and whose work, admirable alike in construction and execution, probably accounts for the recent growth in popularity of this class of fiction. But, though representative, they are a minority; and it is still true that a detective story which fully develops the distinctive qualities proper to its genus, and is, in addition, satisfactory in diction, in background treatment, in characterization, and in general literary workmanship is probably the rarest of all forms of fiction.
The rarity of good detective fiction is to be explained by a fact which appears to be little recognized either by critics or by authors; the fact, namely, that a completely executed detective story is a very difficult and highly technical work, a work demanding in its creator the union of qualities which, if not mutually antagonistic, are at least seldom met with united in a single individual. On the one hand, it is a work of imagination, demanding the creative, artistic faculty; on the other, it is a work of ratiocination, demanding the power of logical analysis and subtle and acute reasoning; and, added to these inherent qualities, there must be a somewhat extensive outfit of special knowledge. Evidence alike of the difficulty of the work and the failure to realize it is furnished by those occasional experiments of novelists of the orthodox kind which have been referred to, experiments which commonly fail by reason of a complete misunderstanding of the nature of the work and the qualities that it should possess.
A widely prevailing error is that a detective story needs to be highly sensational. It tends to be confused with the mere crime story, in which the incidents—tragic, horrible, even repulsive—form the actual theme, and the quality aimed at is horror—crude and pungent sensationalism. Here the writer's object is to make the reader's flesh creep; and since that reader has probably, by a course of similar reading, acquired a somewhat extreme degree of obtuseness, the violence of the means has to be progressively increased in proportion to the insensitiveness of the subject. The sportsman in the juvenile verse sings:
I shoot the hippopotamus with bullets made of platinum Because if I use leaden ones his hide is sure to flatten 'em:
and that, in effect, is the position of the purveyor of gross sensationalism. His purpose is, at all costs, to penetrate his reader's mental epidermis, to the density of which he must needs adjust the weight and velocity of his literary projectile.
Now no serious author will complain of the critic's antipathy to mere sensationalism. It is a quality that is attainable by the least gifted writer and acceptable to the least critical reader; and, unlike the higher qualities of literature, which beget in the reader an increased receptiveness and more subtle appreciation, it creates, as do drugs and stimulants, a tolerance which has to be met by an increase of the dose. The entertainments of the cinema have to be conducted on a scale of continually increasing sensationalism. The wonders that thrilled at first become commonplace, and must be reinforced by marvels yet more astonishing. Incident must be piled on incident, climax on climax, until any kind of construction becomes impossible. So, too, in literature. In the newspaper serial of the conventional type, each instalment of a couple of thousand words, or less, must wind up with a thrilling climax, blandly ignored at the opening of the next instalment; while that ne plus ultra of wild sensationalism, the film novel, in its extreme form is no more than a string of astonishing incidents, unconnected by any intelligible scheme, each incident an independent "thrill," unexplained, unprepared for, devoid alike of antecedents and consequences.
Some productions of the latter type are put forth in the guise of detective stories, with which they apparently tend to be confused by some critics. They are then characterized by the presentation of a crime—often in impossible circumstances which are never accounted for—followed by a vast amount of rushing to and fro of detectives or unofficial investigators in motor cars, aeroplanes, or motor boats, with a liberal display of revolvers or automatic pistols and a succession of hair-raising adventures. If any conclusion is reached, it is quite unconvincing, and the interest of the story to its appropriate reader is in the incidental matter, and not in the plot. But the application of the term "detective story" to works of this kind is misleading, for in the essential qualities of the type of fiction properly so designated they are entirely deficient. Let us now consider what those qualities are.
The distinctive quality of a detective story, in which it differs from all other types of fiction, is that the satisfaction that it offers to the reader is primarily an intellectual satisfaction. This is not to say that it need be deficient in the other qualities appertaining to good fiction: in grace of diction, in humour, in interesting characterization, in picturesqueness of setting or in emotional presentation. On the contrary, it should possess all these qualities. It should be an interesting story, well and vivaciously told. But whereas in other fiction these are the primary, paramount qualities, in detective fiction they are secondary and subordinate to the intellectual interest, to which they must be, if necessary, sacrificed. The entertainment that the connoisseur looks for is an exhibition of mental gymnastics in which he is invited to take part; and the excellence of the entertainment must be judged by the completeness with which it satisfies the expectations of the type of reader to whom it is addressed.
Thus, assuming that good detective fiction must be good fiction in general terms, we may dismiss those qualities which it should possess in common with all other works of imagination and give our attention to those qualities in which it differs from them and which give to it its special character. I have said that the satisfaction which it is designed to yield to the reader is primarily intellectual, and we may now consider in somewhat more detail the exact nature of the satisfaction demanded and the way in which it can best be supplied. And first we may ask: What are the characteristics of the representative reader? To what kind of person is a carefully constructed detective story especially addressed?
We have seen that detective fiction has a wide popularity. The general reader, however, is apt to be uncritical. He reads impartially the bad and the good, with no very clear perception of the difference, at least in the technical construction. The real connoisseurs, who avowedly prefer this type of fiction to all others, and who read it with close and critical attention, are to be found among men of the definitely intellectual class: theologians, scholars, lawyers, and to a less extent, perhaps, doctors and men of science. Judging by the letters which I have received from time to time, the enthusiast par excellence is the clergyman of a studious and scholarly habit.
Now the theologian, the scholar and the lawyer have a common characteristic: they are all men of a subtle type of mind. They find a pleasure in intricate arguments, in dialectical contests, in which the matter to be proved is usually of less consideration than the method of proving it. The pleasure is yielded by the argument itself and tends to be proportionate to the intricacy of the proof. The disputant enjoys the mental exercise, just as a muscular man enjoys particular kinds of physical exertion. But the satisfaction yielded by an argument is dependent upon a strict conformity with logical methods, upon freedom from fallacies of reasoning, and especially upon freedom from any ambiguities as to the data.
By schoolboys, street-corner debaters, and other persons who are ignorant of the principles of discussion, debates are commonly conducted by means of what we may call "argument by assertion." Each disputant seeks to overwhelm his opponent by pelting him with statements of alleged fact, each of which the other disputes, and replies by discharging a volley of counterstatements, the truth of which is promptly denied. Thus the argument collapses in a chaos of conflicting assertions. The method of the skilled dialectician is exactly the opposite of this. He begins by making sure of the matter in dispute and by establishing agreement with his adversary on the fundamental data. Theological arguments are usually based upon propositions admitted as true by both parties; and the arguments of counsel are commonly concerned, not with questions of fact, but with the consequences deducible from evidence admitted equally by both sides.
Thus the intellectual satisfaction of an argument is conditional on the complete establishment of the data. Disputes on questions of fact are of little, if any, intellectual interest; but in any case an argument—an