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From the liner notes

This dark tale of supernatural possession from director Manuel Carballo combines classic horror with riveting family drama. Fifteen–year–old Emma (Sophie Vavasseur) is going through the growing pains of teen life, believing her parents don't understand her and longing for the independence that's still a few years away.

When Emma falls prey to a series of seizures that leave doctors and psychologists baffled, her parents summon a priest (Doug Bradley) to help the girl. But what lurks inside Emma is far more dangerous than they could have ever imagined. Exorcismus mounts to a pitch of horror from which you won't be able to turn away.