As Agatha Christie wrote, Death Comes As The End, but not to her "cosies."

Big publishers now have probate departments:

David Brawn, estates publisher at HarperCollins, says that the resurgence of interest in the golden age is largely driven by practical concerns. “One of the main reasons behind the sudden popularity of crime from this period is that modern publishing and new technology allows for shorter runs in printing, which means that we can now mine backlists that would previously have been unprofitable,” he says. “We’ve had a lot of success with the Detective Story Club imprint, which tries to bring some of the best less well-known writers of the Christie era to public attention.”