Musim 4・The search for a missing Navajo girl takes Leaphorn, Chee, and Manuelito from the safety of Navajo Nation to the gritty terrain of 1970s Los Angeles in a race against the clock to save her from an obsessive killer with ties to organized crime.

A man is asked by his ex girlfriend to care temporarily for her senile mother, Alicia. But Alicia won't let him leave, turning a simple task into a nightmare he must escape.