Elly is a botanist studying invasive plant species in the southwest. Heading home, she witnesses a plane crash and investigates. The crash site is where she encounters Tomas, a drug mule bent on completing his run. Facing death, Elly offers to help Tomas get to his destination. Unfortunately, Guillermo, who was supposed to receive the drug shipment, thinks he has been double-crossed. What follows is a chase across the desert, with Elly and Tomas fearing for their lives.