What dangers lurk above?Pat O'Toole and his brother, Coop, are on the run from an enemy that specializes in hiding in plain sight. Along with their new companion, Kate, they've narrowly escaped a cultlike community situated beneath the streets of New York City. Kate has lived underground since birth, and the world above thrills her, but it's treacherous as well. With the cult's leader -- Kate's grandfather -- hatching a new scheme of global...