Melanie is a young woman whose ambitions as a concert pianist were dashed as a child by the thoughtless behavior of the jury chairwoman, the famous pianist Madame Fouchecourt, during her exam. Ten years later, Melanie sets up an elaborate plan for revenge and soon begins to ingratiate herself into the family. Unrecognized by Madame Fouchecourt, Melanie becomes her trusted "page turner" as both women prepare for the performance of a lifetime.
