Handsome and rich Spanish gentleman abandons his wife and riches for his love of a young girl of poor stock who taunts and degrades him.

Business executive Odile seeks a new, larger apartment. Her younger sister Camille, having completed her doctoral thesis in history, is a Paris tour guide. Simon is a regular on Camille's tours as he's attracted to her. However, Camille has fallen for Marc, and they begin an affair. Nicolas is also looking for an apartment, since he hopes to eventually have his family join him in Paris.

A secret agent sets out to stop an evil scientist who is about to unleash on the world a virulent biological strain he has developed during experiments on rats.