Two men who have been friends since childhood find themselves on opposite ends of the law.

A war correspondent who was stationed in Paris during WW II married a French girl who was murdered by the Nazis. After the war he returns to to try to find his son, whom he lost during a bombing raid but has been told is living in an orphanage in Paris.

A new infection that simply makes people feel happy is treated as a threat by the authorities while its "victims" work to spread it to others.