Sigma Force

An inexplicable explosion rocks the antiquities collection of a London museum—a devastating blast that sets off alarms in clandestine organizations around the world, as the race begins to determine how it happened, why it happened, and what it means. 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.