From NetFlix:

As a child, pianist Melanie’s ( Déborah François) dream of
studying at a prestigious musical conservatory is shattered
when the chairwoman of the jury ( Catherine Frot) distracts
her during an audition. Years later, a coincidence leads to
Melanie’s employment in the woman’s household, and she
finds herself in the perfect position for revenge. Directed by
Denis Dercourt, this stylish psychological drama co-stars
Pascal Greggory.

Stephen King’s forte is revenge. But his revenge is usually
physically violent and just plain fun. On the other hand,
“The Page Turner” is French to the core. Subtle, quiet,
polite, it had me on the edge of my seat because I felt
that any minute something really awful was going to happen.

I strongly recommend this movie (NOT FOR CHILDREN)
and will only say “Don’t expect a happy ending”.

Stay alert.