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304 pages, Paperback
First published January 1, 1973
1. The criminal must be mentioned in the early part of the story, but must not be anyone whose thoughts the reader has been allowed to know.These "ten commandments" (reproduced from Wikipedia) for writing detective fiction are from Father Ronald Knox, who was a Catholic priest who wrote whodunits while he was not busy saving souls. He operated during the so-called "Golden Era" of detective fiction during the 1920's and 30's. As a priest, one suspects that he couldn't refrain from making up rules so that his flock doesn't stray from the straight and narrow path: also, to take a more charitable view, he may have been fed up with the standard tropes dished out in run-of-the-mill investigative thrillers.
2. All supernatural or preternatural agencies are ruled out as a matter of course.
3. Not more than one secret room or passage is allowable.
4. No hitherto undiscovered poisons may be used, nor any appliance which will need a long scientific explanation at the end.
5. No Chinaman must figure in the story. (Note: This is a reference to the common use of heavily stereotyped Asian characters in detective fiction of the time).
6. No accident must ever help the detective, nor must he ever have an unaccountable intuition which proves to be right.
7. The detective himself must not commit the crime.
8. The detective is bound to declare any clues which he may discover.
9. The "sidekick" of the detective, the Watson, must not conceal from the reader any thoughts which pass through his mind: his intelligence must be slightly, but very slightly, below that of the average reader.
10. Twin brothers, and doubles generally, must not appear unless we have been duly prepared for them.