I read this book when it was new (early 1980s) and for some reason remembered it pretty vividly after all these years, so I tracked it down and re-read it. It is still enjoyable, though a little bit dated (e.g., liberal use of "the other f-word," though one of the characters does challenge that attitude). Because the people investigating the crime are fire marshals, it's a different twist on the "police procedural."