Following a home invasion, wealthy businessman Nelson goes on a desert trip with his wife Margo and lawyer friend Jack. Their journey changes when Jack inadvertently helps Nelson fall over a cliff. When Jack and Margo return with the sheriff, they find Nelson's body gone, suggesting he's alive. As Nelson fights to survive the harsh environment and his own deteriorating mental state, two searches for him begin – one led by a growingly suspicious sheriff, and another by the untrustworthy Margo and Jack.