In September of 1940, Ned Smith, Professor of Physics at a small men's college in Illinois, gets a telegram inviting him to join a secret project at MIT. He jumps at the chance, even if it means parting from attractive and intelligent Dorothy Wilson, just as they are getting to know each other. In the next few months, while Franklin Roosevelt runs for his third term and Britain seems ever more likely to succumb to a Nazi invasion, Ned feverishly works on the Radar project in Cambridge,...