Same Old Song (1997)

What it's about

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.