Something has been let loose in the city: an airborne horror that leaves a tunnel full of corpses below the streets of Seattle, just as experts from 50 nations are gathering downtown for an international symposium on chemical and biological weapons.As the city grinds to a halt, true-crime author Frank Corso is evacuated from his friend Meg Dougherty's first photographic exhibition. All too soon, he unwittingly establishes himself as a prime suspect in this deadly conspiracy. When Meg returns home to a terrifying scene of her own, Corso is hauled in by the police and quickly learns of one brutal death that could be linked to the impending destruction of thousands, perhaps millions, of innocent lives.