Award-winning journalist Stephen Baker traces the rise of the "global math elite": computer scientists who invent ways to not only record our behavior, but also to predict and alter it. Nowadays, we don't need to be online to create a digital trail; we do it simply by driving through an automated tollbooth or shopping with a credit card. As massive amounts of information are collected, sifted, and analyzed, we all become targets of those who want to influence everything from what we buy to how we vote.