A controversial wild horse round-up in the high desert of Nevada results in two murders and too many suspects for Sheriff Porter Beck to deal with.

A helicopter driving a controversial round-up of wild horses suddenly crashes and the pilot is found to have been shot. Then the person coordinating the round-up for the Bureau of Land Management is savagely murdered, buried up to her neck and then trampled to death by the very same wild horses. And there's no lack of suspects—with the wild horse advocacy group having sworn to protect the horse At Any Cost! Now the state and federal agencies are showing up looking for answers or at least a scapegoat.

Sheriff Porter Beck has had better days.

Porter Beck's new girlfriend, Detective Charlie Blue Horse, arrives to help with the investigation, which leads them to Canadian Lithium mining operation near the round-up area that sets off Beck's mental alarm bells. Brinley, Beck's sister, is leading a group of troubled kids in a wilderness program, when one of them, Rafa, bolts one night. When Brinley catches up to him, they're just outside the mine—in the wrong place, at the wrong time.

With his personal life in turmoil, too many suspects and too many secrets, the feds pushing for a quick resolution, and his impetuous (if skilled) sister in the mix, one wrong step could be deadly for Porter Beck.