Lester Del Rey 
And There Was Light [EPUB ebook] 

In a world divided, Johann Volcek makes a startling discovery that could end the threat of war forever. With the support of the powerful Director, Volcek prepares to test his invention on a global scale. As the fateful hour approaches, Johann reflects on his work and dreams of a peaceful future for his wife Stefanie and their unborn children. But when the switch is flipped…