But many modern mysteries simply do not cut it. Once everyone figured out Rex Stout was dead, the only name offered was Ed McBain. Now these were all mystery fans, but they offered none of the modern writers for consideration. Because most modern American mystery is character driven, not plot driven. Few puzzles worthy of the name, no grand denouement.
People miss that.
As good as the Tony Hillerman's, Sara Paretsky's etc. are, and they are very good indeed, they are not delivering the element of surprise that old time mysteries gave. But for some reason, readers put PI novels in a different category. If you accept that reasoning, then maybe it's time for the return of the puzzle mystery. But in the modern market you might be wise to adapt and come up with true, character driven puzzle mysteries. Then watch the money roll in.