Okay, so I'm looking for a foreign film I haven't seen in years and can't remember the name of it for my life...

Okay, so I'm looking for a foreign film I haven't seen in years and can't remember the name of it for my life. It's either French or German. The movie starts out with a young girls parents being murdered I front of her after they answer the doorbell, she passes out and then it cuts to her in a mental institution being evaluated for release to go work as a tutor at some rich family's summer vacation house teaching French or German. Fast forward and she begins to see the man that killed her parents around the house/property and the rich kids start to turn up brutally murdered.

Anyone?

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"Martyrs"

Nah, that's not it. Thanks though.