Hungarian physicist Leo Szilard leaves Europe, eventually arriving in the United States. With the help of Einstein, he persuades the government to build an atomic bomb. The project is given to no-nonsense Gen. Leslie Groves who selects physicist J. Robert Oppenheimer to head the Los Alamos Laboratory in New Mexico, where the bomb is built. As World War II draws to a close, Szilard has second thoughts about atomic weapons, and policy makers debate how and when to use the bomb.

The story of John Henry Faulk, a radio/TV personality of the 1950s, who was blacklisted during the McCarthy era. Faulk sued the organization that was behind the blacklisting, and the resultant trial, and Faulk's victory, helped to put an end to the blacklisting period.