Just three months into a new relationship, Roger Sargeant, his new girlfriend Shelly and her two young daughters Tiffany (9) and Michaela (5) are on a day trip in the Arizona desert. Things go badly wrong when they get lost and are then forced to abandon their car. In a desperate bid to walk out they become separated. Over two hellish days and nights, Roger and Shelly's family, independently battle to escape soaring summer heat, dehydration, hostile terrain, rattlesnakes and prowling gangs of people smugglers.