A bit late here, but my thought is that the plot line is a necessarily evil, particularly in mysteries(where it is most necessary), where we are really interested in the chase itself. The resolution is always a letdown, if for no other reason than that it signals the end of our journey.

The final exposition is often the worst part in a mystery, because after an energetic romp, the writer and reader are compelled to sit thru an accounting of it all, much in the manner of preparing an expense report.

"Huckleberry Finn" ending has been a problem for literary essayists since it was published, and, would Stevenson have paired Dr. Jeckyll and Mr. Hyde in the title of his book, had he not wanted us to associate them from the beginning?

Here are Twenty Rules for Writing Detective Stories that are impossible for even the best writers to adhere to:-)