This is not a step-by-step guide but rather a reference source, in which each of eighty-plus contributors gives advice on a specific step in the mystery-writing process (e.g. research, plot development, characters, point of view, dialogue, background, revision, series management), followed by an exercise for the fledgling writer to address the issue.
Some of the contributors are quite well-known (Louise Penny, John Lutz, Simon Brett, Hallie Ephron, Katherine Hall Page, Rhys Bowen, Bill Crider, and others), and all have solid professional credentials. Most are interesting, at least some potentially useful to the reader willing to follow instructions.