When game warden Luke Dutton hears a gunshot while he's out repairing fencing on his ranch in Alberta's foothills, he has no idea that single shot is going to set into motion events that will turn his world upside down. The more he discovers, the less he knows about what's going on in the Highwood River Valley, and the more he realizes things don't add up.Between the revelation that there's a serial killer living in their midst, the Dutton family's discovery of the long-lost Lemon Gold Mine, and the damage that Black Eagle Gas will do to the Duttons' ranch when they begin fracking, Luke has his hands full. Add water problems caused by climate change, drug-related problems on the local First Nations reserve, and dealing with numerous violations of hunting and fishing laws to the Duttons' challenges in an everchanging world.As things come to a head and Luke works to keep the ranch solvent and his family safe, will the RCMP catch the killer before he kills again?