"Late on a bright summer's day, a two-ton rod of tungsten plummets from the sky over America. Unstoppable. Undetectable. Where it strikes, nothing remains. Only a crater. They call this weapon the Hammer of God - and it will fall again. And again. And again. Only special operators Christopher Wren and Sally Rogers, half a world apart, can unravel the twisted conspiracy driving the Hammer, and halt it before America loses what it values most..."