The two Novalic brothers, Jean and Martial, are in love with the same woman, Genevieve. Jean is an impoverished actor and an idealistic dreamer, who does not want Genevieve to share in his life of suffering. Martial is an internationally-respected astronomer who discovers the return of Lexell's Comet, on a collision course for Earth. Meanwhile, the rich play while the world is arming for war. Martial decides to use the impending threat of world destruction to reorganize and improve global society. But he is opposed by the rich financiers and government officials who stand to lose their power and influence.