26 years ago: A girl in South Dakota falls through the earth, then wakes up dozens of feet below ground on the palm of what seems to be a giant metal hand. 9 years ago: She is a top-level physicist leading a team of people to understand exactly what that hand is, where it came from, and what it portends for humanity. Today: with the remainder of the giant robot found and assembled, every question answered about the mysterious contraption raises two more. But the team behind the greatest discovery of the last millennium might be out of time when a second robot suddenly appears, looming over downtown London.