You have no idea how SICK this sounds to a Protestant!
Is this one of those novenas that NEVER fail?
When a person prays, whether directly to God, or through the intercession of saints, angels, the Holy Souls in Purgatory, or other people on earth, if their intention is ultimately in accordance with the Holy Will of God, God will hear and answer their prayer according to His Infinite Wisdom and Love.
And in my life, prayer such as this has been answered: sometimes in ways I can't explain, sometimes in a result other than what I have asked, but never without a deeper love of God and increased trust in His Holy Will.