In the carefree days before World War I, introverted Austrian author Jules strikes up a friendship with the exuberant Frenchman Jim and both men fall for the impulsive and beautiful Catherine.

Brittany is ethnically rather different from the rest of France and is the home of the largest number of Celtic-speakers outside of the British Isles and Ireland. This French film follows one young man who leaves his Breton homeland and journeys to Paris with the intention of living there. Despite some success in finding work and friends, Paris is not home and the Parisians are not family, so he returns to work with his own people.

Alain, "a young wolf", elegant and racy, is maintained by the princess Linzani. At the same time, he goes out with a girl of his age, Sylvie, who despite her bold attitude has never had a lover.

FBI agent John Lewis travels in Europe, from Paris to Lisbon, trying to locate a disappeared fellow secret-agent, Mark Lemoine. Soon he has trouble with a violant gang, and is involved with a young French reporter, Michèle Laurent. Finally, the chief of the Secret Service tells Lewis that Lemoine never existed. Instead of ending his mission there, the real trouble starts.

A scientist from the East happens in France where it is supposed to improve one of his inventions. But it is much more interested in the fact to enjoy it and have fun ...