The Mr. and Mrs. North Mysteries in the Pocket Books editions often have nice skeletons adorning the covers.
Having very little experience with the mysteries of Arthur Conan Doyle (at least in written form), I was not even aware of the existence of this volume of non-Sherlock Holmes stories, Tales of Terror and Mystery. Lovely cover, and I will certainly give them a try.

The skull cover for The Hound of the Baskervilles is a little less impressive (as skull covers go), but very atmospheric. And I have added to my available Sherlock mysteries to try.

In 1991, Julie Smith was the first American woman to be awarded the Edgar for Best Mystery Novel since 1956. The winning book was New Orleans Mourning, and was the first in a series starring Skip Langdon, a female police officer.
The Axeman's Jazz is the 2nd book in the Skip Langdon series. I have a copy of the hardcover edition which is much better because the skeleton is not obscured as much.

And now we get to my favorite cover of the lot... at least as far as cover art goes. The Straight Man by Roger L. Simon. I don't know how well the cover fits the story. Moses Wine takes on a case for his psychiatrist, in the fifth book in the series. Set in West L.A.

