An ingenious new thriller that weaves a path through history, following a race of human-like machines that have been hiding among us for untold centuries, written by the New York Times bestselling author of Robopocalypse. Present day: When a young anthropologist specializing in ancient technology uncovers a terrible secret concealed in the workings of a three-hundred-year-old mechanical doll, she is thrown into a hidden world that lurks just under the surface of our own. With her career and her life at stake, June Stefanov will ally with a remarkable traveler who exposes her to a reality she never imagined. Russia, 1725: In the depths of the Kremlin, the tsar's loyal mechanician brings to life two astonishingly humanlike mechanical beings. Peter and Elena are a brother and sister fallen out of time, possessed with uncanny power, and destined to serve great empires. Struggling to blend into pre-Victorian society, they are pulled into a legendary war that has raged for centuries. Richly-imagined and heart-pounding, Daniel H. Wilson's novel expertly draws on his robotics and science background, combining exquisitely drawn characters with visionary technology and riveting action.