My first suspense novel, McKain’s Dilemma, was published in hardcover as part of Tor’s new but quickly aborted mystery line. After the editor left the house, the book was orphaned, and the line quickly vanished. I doubt if 500 copies of the book were sold.
It was a shame, as the book was my attempt at a more realistic mystery novel, with the private eye protagonist being a family man who stumbles into a murder somewhat by accident, and writing the first person narrative for a definite reason. I alternated the first person sections with third person segments dealing with various characters to deal with various points of view. Another plot element of interest was that the private detective was suffering from a terminal illness (which somewhat diminished the possibility of a series). The novel, though it received positive reviews, was never published in paperback, has long been out of print, and is available in the used book market.