The young Polish physics student Marie, soon falls in love with and marries Dr. Pierre Curie, in whose lab she had worked. On their honeymoon they decide to investigate a strange effect Professor Becquerel has noticed with the uranium/thorium stones for Marie's dissertation, and they determine there must be additional radioactive elements causing it. After years of experimentation in a makeshift lab at the University, they are finally able to isolate a few grains of a new element, radium, from 7 tons of raw material. Unfortunately, at the height of their success, tragedy strikes.