Follow the Shadow Wolves, an elite unit of Native American federal agents that track down drug smugglers coming into the United States from Mexico across the Tohono O’odham Indian Reservation in Arizona. The Wolves reveal their traditional tracking techniques while patrolling across their vast area of operations, 2.8 million acres in the Sonora Desert. For a 12-person unit, covering this much ground requires a great deal of patience and determination. We join agents Dave, Gary and Joe as they detect sign and hunt down smugglers, recovering almost half a million dollars worth of marijuana. Danger is eminent out in the middle of the desert during the night with only coyotes and rattlesnakes to keep the agents company.