The Rise and Fall of D.O.D.O.

When Melisande Stokes, an expert in linguistics and languages, accidently meets military intelligence operative Tristan Lyons in a hallway at Harvard University, it is the beginning of a chain of events that will alter their lives and human history itself. The young man from a shadowy government entity approaches Mel, a low-level faculty member, with an incredible offer. The only condition: she must swear herself to secrecy in return for the rather large sum of money.
Tristan needs Mel to translate some very old documents, which, if authentic, are earth-shattering. They prove that magic actually existed and was practiced for centuries. But the arrival of the scientific revolution and the Age of Enlightenment weakened its power and endangered its practitioners. Magic stopped working altogether in 1851, at the time of the Great Exhibition at London's Crystal Palace—the world's fair celebrating the rise of industrial technology and commerce.
Something about the modern world “jams” the “frequencies” used by magic, and it's up to Tristan to find out why. And so the Department of Diachronic Operatives—D.O.D.O.—gets cracking on its real mission: to develop a device that can bring magic back, and send Diachronic Operatives back in time to keep it alive . . . and meddle with a little history at the same time. But while Tristan and his expanding operation master the science and build the technology, they overlook the mercurial—and treacherous—nature of the human heart.

Neal Stephenson is the bestselling author of the novels Reamde, Anathem, The System of the World, The Confusion, Quicksilver, Cryptonomicon, The Diamond Age, Snow Crash, and Zodiac, and the groundbreaking nonfiction work In the Beginning . . . Was the Command Line. He lives in Seattle, Washington.