In 1970s Southwest, Navajo police officers Leaphorn and Chee continue to face cases that test their instincts and their spiritual beliefs. Season 4 follows the urgent search for a missing Navajo girl, drawing Leaphorn, Chee, and Manuelito beyond Navajo Nation and into the harsh streets of 1970s Los Angeles as they race to find her before an obsessive killer with organized-crime ties can strike.