Rash, a poet and novelist, has deep roots in western North Carolina. I chose this book because I like "natural resource mystery novels," and the protagonists are a newly retired county sheriff and a state park ranger.
The honorary parents of the "natural-resources mystery novel" might be Tony Hillerman (1925–2008) and Nevada Barr. Hillerman's two Navajo tribal policemen, Lt. Jim Leaphorn and Officer (later Sgt.) Jim Chee, deal with all sort of crimes, but a percentage of them involve people wanting to exploit something about the Big Reservation—archaeological sites, minerals, whatever. (His daughter, Anne, carries on the series.)
Barr (b. 1952) worked in theatre and television before taking a job as a seasonal National Park Service ranger at Guadalupe Mountains National Park in Texas, the site of her first mystery novel, Track of the Cat (1993), which introduced protagonist Anna Pigeon, a Park Service law-enforcement ranger.
All I can say about Ranger Pigeon is that she is extraordinarily physically resilient. Any actual NPS ranger with her list of injuries — all logged here — would have retired on full disability five or six books ago. Wikipedia sums up Barr's plots: "The books in the series take place in various national parks where Pigeon solves murders that are often related to natural resource issues."
So it would seem that natural-resources crime would be perfect for mystery writers. It does not always work out that way.
Wyoming writer C. J. Box created state game warden Joe Pickett, who first appeared in Open Season (2001), followed by eighteen more. As the series moves on, Joe Pickett quickly spends less and less time catching poachers, etc., and more being a sort of special investigator for the governor of Wyoming, although that gig ends when the governor leaves office.
A typical plot involves Joe getting in over his head facing a family of criminals, drug-cartel sicarios, or some other baddies, only to be rescued by his own personal "noble savage," the mystic falconer/special-ops veteran Nate Romanowski, who appears suddenly to save the day, eliminating bad guys with his .454 Casull revolver by shooting offhand from half a mile away.
Box can write a tight thriller — the Cassie Dewell novels, starting with The Highway, are better-plotted and less repetitious than the Joe Pickett series.
Maine is not Wyoming, and Paul Doiron's series about Maine warden Mike Bowditch seem more rooted in nature and culture than Joe Pickett's Wyoming. Maybe that is because Doiron used to edit Down East, "the magazine of Maine." The series begins with The Poacher's Son (Mike, of course)
The next one I need to read is The Precipice. Here is the synopsis:
When two female hikers disappear in the Hundred Mile Wilderness — the most remote stretch along the entire Appalachian Trail — Maine game warden Mike Bowditch joins the desperate search to find them.
Hope turns to despair after two unidentified corpses are discovered, their bones picked clean by coyotes. Do the bodies belong to the missing hikers? And were they killed by the increasingly aggressive wild dogs?
Soon all of Maine is gripped by a fear of deadly coyote attacks. But Bowditch has his doubts. His new girlfriend, wildlife biologist Stacey Stevens, insists the scavengers are being wrongly blamed. She believes a murderer may be hiding in the offbeat community of hikers, hippies, and woodsmen at the edge of the Hundred Mile Wilderness. When Stacey herself disappears along the Appalachian Trail, the hunt for answers becomes personal.Real police work is bureaucratic — and so is being a game warden or park ranger. But because they so often work alone, far from back-up, they make appealing protagonists with a dose of "What would I do out there?"