Nate Wilde is a former Green Beret and aspiring Harvard archaeologist. Leaving the military after a catastrophic deployment that leaves most of his team dead or injured, he chooses to pursue his passion for history. When his dissertation proposal to search for the legendary lost city of Ubar in Saudi Arabia is rejected by the Harvard examining committee and his expedition permit is denied by the Saudi government, Nate resolves to continue his research by any means necessary. And the only path left to him is to enter Saudi Arabia’s Empty Quarter through war-torn Yemen, the same sands where his brothers lost their lives years prior.

Knowing he’s going back into harm’s way, Nate turns to the only men left alive that he truly trusts: Sergeant Benjamin “Wally” Walton, a medic formerly with the British Special Air Service; Shane Price, UFC fighter turned Green Beret and an affluent playboy; and Sergeant Tim McBride, Nate’s former best friend and a true warrior. Along the way the group meet Ana Metry, a geologist of Egyptian heritage searching for her missing father, who possesses the research key to Nate’s quest.

Hunted by a former Spetsnaz soldier who works for a shadowy organization with unknown goals, and chased through the desert by al Qaeda terrorists, the former commandos must utilize the skills of their past profession in a race to discover whether the city truly exists, as well as uncover a deeper geopolitical mystery that will have resounding global ramifications.