Württemberg, Germany, 1618: Plague is spreading. The Thirty Years' War has begun, and fear and suspicion are in the air throughout the Holy Roman Empire. In the small town of Leonberg, Katharina Kepler is accused of being a witch. Her scientist son must turn his attention from the music of the spheres to the job of defending his mother. Drawing on real historical documents but infused with the intensity of imagination, sly humor, and intellectual fire.