New Mexico Undersheriff Bill Gastner is presented with a case that appears to have brought big-time crime, including drug gangs, into Posadas County.

A newly minted graduate of the University of Pennsylvania Medical School in 1890, Dr. Thomas Parks heads to the big timber country of Puget Sound to practice trauma medicine. An hour after stepping off the boat, he's nearly crushed to death by a less-than-sure-footed mule and finds himself a patient rather than a physician. As he convalesces, he discovers that his host, a venerable physician friend of his father's, is running an elaborate medical scam, selling worthless concoctions nationwide, with enormous sales.

In a wicked conspiracy reaching across the Mexican border, Tularosa pits a jaded ex-cop against tight-lipped Army personnel, hired thugs, and smooth-talking outlaws. Forced into retirement by a crippling gunshot wound, Santa Fe policeman Kevin Kerney seeks solitude on a small New Mexico ranch far from the nearest neighbor. But when his godson disappears without a trace into the harsh, high-security desert of the White Sands Missile Range, Kerney emerges to search for the young soldier.

The ancient Indian art of tracking is his greatest strength...and also his biggest weakness. Fish and wildlife state trooper Gabriel Hawke believes he’s chasing poachers. However, he comes upon a wildlife biologist standing over a body that is wearing a wolf-tracking collar. He uses master tracker skills taught to him by his Nez Perce grandfather to follow clues on the mountain. Paper trails and the whisper of rumors in the rural community where he works draws Hawke to a conclusion that he finds bitter.

Harney County, Oregon, 1968: Nick Drake has a chest full of medals and enough demons to fill a duffel bag. He's been trained to kill but was never retrained to rejoin society. Drake flees to the lonesome high desert in search of redemption and takes a job patrolling wildlife refuges where the only conflicts are keeping out stray cows and ticketing poachers. But then he stumbles across a girl's body ritually placed in a gully. Her murder is only the beginning, and Drake must face humanity's heart of darkness once again if he's to stop a killer from turning even more gullies into graves.