2050 London: The Esthers send Olivia on a heist into the Vertical City--a mile-high tower, the last refuge for wealthy Americans who have lost their country.  But there's incredible danger waiting for her on all sides: the mysterious killer from her nightmares, machine-augmented men, the most powerful C.E.O. in the world. And there is also, as it turns out, an even greater danger for Olivia: a love triangle.