Sergeant John Kinley is on his last tour of duty in Afghanistan when he is teamed up with local interpreter Ahmed to survey the region. When their unit is ambushed on patrol, Kinley and Ahmed are the only survivors. With enemy combatants in pursuit, Ahmed risks his own life to carry an injured Kinley across miles of gruelling terrain to safety. Back on U.S. soil, Kinley learns that Ahmed and his family were not given passage to America as promised. Determined to protect his friend and repay his debt, Kinley returns to the war zone to retrieve Ahmed and his family before the local militias reach them first.