Leading man Michel Piccoli plays Pierre, a young musician who briefly catches sight of a beautiful woman dressed in blue and soon spends all of his time trying to track her down. After roaming the streets of Paris in search of the mystery woman, he recruits an old friend to help find her.

Catherine, a young British prostitute living in Paris, decides to start her own "company" after learning the basics of big businesscom from her clients. She encounters both interest and setbacks in her search for investors.