Lady Kara Kensington’s family paid a high price in money and blood to found the gallery that now lies in ruins. And her search for answers is about to lead Kara and her friend Safia al-Maaz, the gallery’s brilliant and beautiful curator, into a world they never dreamed actually existed. For new evidence exposed by the tragedy suggests that Ubar, a lost city buried beneath the Arabian desert, is more than mere legend … and that something astonishing is waiting there. Two extraordinary women and their guide, the international adventurer Omaha Dunn, are not the only ones being drawn to the desert. Former U.S. Navy SEAL Painter Crowe, a covert government operative and head of an elite counterespionage team, is hunting down a dangerous turncoat, Crowe’s onetime partner, to retrieve the vital information she has stolen. And the trail is pointing him toward Ubar.