Rules for Writing Detective Stories by S.S. Van Dine (1928)
thrillingdetective.com
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The list shrank back. "I'll not be questioned from the likes of you, why, you... reader!"
The moll knew. Decades of fanatical typing but declining sales had forced the list to put on airs, to rise above the common man. But chumps like me could see right through it, and she knew it. Oh, she knew it.
I leaned back in my chair, and took the last drag on my stub of a cigarette. Exhaling, I blew smoke toward the open door. She turned, and followed it out into the dark night. Into the city that knows how to keep its secrets.
[1]"Ten Commandments for the Detective Novel" http://www.thrillingdetective.com/trivia/triv116.html
[2]"The Simple Art of Murder" http://www.en.utexas.edu/amlit/amlitprivate/scans/chandlerar...
Didn't read a lot of books from Van Dine, I just remember they are very dry, because he is fascinated with the mechanics of the detective novel. I didn't like it, but give it a try, his approach might appeal to you.
If only the makers of genre movies would take this rule to heart! It would make for tighter plots and shorter running times. How many thrillers, action flicks, superhero films, disaster, spy and scifi movies have been marred by inserting some half-baked love story into it?
We are talking about genres that completely lost any suspense and thrill, because ending is predictable from the beginning.
It is as if genre movies completely resigned on story and writing. It is just eye candy at this point.
I don't think it used to always be like that, because I have seen some older movies lately and characters (including supporting cast) made more sense.
After hearing that, I can now see why they get added to every single movie.
Many TV shows fail on this point trying to surprise the viewer with an unexpected result which ironically becomes so common that ends up being predictable from the first few minutes of the show.
Edit: they also fail in number 2 and 5.
I think it's one of those situations in which you deviate from the rules either because you don't know what you are doing, or because you know precisely what you are doing.
Although modern writers would likely find a list like this too narrow, I think the base point of being fair to the reader is a good one. It's one that, as many others have pointed out in this thread, many mystery stories today would benefit from.
I realise that my favorites detective stories (those of brother Cadfael from Ellis Peters) all break those rules to good effect, building a good sense of place and time. The romance always involve characters concerned by the crime (suspect, family member of the deceased, guilty party...), but never the detective.