The exciting conclusion of the "Blackbird" series... With Nazca in ruins and Elizabeth missing, Penelope must struggle to find her lover, and then determine if she is a Lyran agent, or a victim of the insidious Mr. Grey. That, and win her right to wield Excalibur, and the Sangreal. But her path to the summit of the Ladder is filled with perils, and she must call upon all of her powers to win her way through the tests that await her. Nothing less than the lives of millions of unsuspecting humans hangs in the balance.