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Specifically on Tapply's Elements of Mystery Fiction, I bought the book, and was disappointed to find almost nothing concerning the plotting issues I raised in the question. Alas.
Answer
#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/1655 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/1655 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/