It appears out of nowhere in the skies above Antarctica: a blazing sphere of light that transforms into a mysterious symbol for all to see. Then it vanishes. The world is enraptured by the event. Is the symbol man-made? Is it of extraterrestrial origin? Or is it a sign from God? The entire human race holds its breath, desperate for an answer, but will it be the one they're hoping for? For Grace Logan, it's the story of a lifetime. And her search for the truth will lead her from an ancient monastery in the sands of Egypt to a megachurch in Texas and into a mystery that she may not survive. For Matt Sherwood, it's a chance to redeem himself - and to find the men respossuble for the death of his brother. And for a few shady players in the corridors of power in Washington, D.C., it's a chance to redefine the world - and to manipulate the relationship between religion and politics in America, for better . . . or for worse.