MUrder in the Mausoleum — Bob Moats

In this 5th book of the Nick Cain mysteries, Nick and Sally decide to dig up her parents and place them in a new mausoluem in Jake Wyler's cemetery. Unfortunately the final day of the burial they discover a body already occupying the crypt  Nick and Detective Bill Emwards investigate and eventually catch the killers. This book is a novella, shorter than a novel but longer than a short story.