To save her dying mother, Lupe, a Mexican-Navajo mechanic bands together with an outlaw cowgirl. Together they must travel across the desert, outrun criminals, and confront a corrupt landowner.

Unable to pay for her mother's medical treatment, Lupe Reyes, a Mexican-Navajo mechanic, sets out for help from her father whom she's never met. On the way, she is bound to Maddy Monroe by accidentally helping her rob a pawn shop. Lupe and Maddy must outrun the men from the pawn, travel to Alta Valley, and confront Lupe's father Carl for the first time. Upon their arrival Carl's many injustices are revealed, including his mistreatment of Lupe's Navajo family, forcing Lupe to stand up to the corruption.