The shadow falls in such a direction as the sun wills: we do not have free will about having free will. Those who believe in free will save themselves - but lose the world.
Things are predetermined, though we can never know for sure in what way they are determined. Thus we have fate and destiny, yet also mystery.
Ultimately, however, there can be no predetermination as things necessarily pre-exist in their causes. If a thing already exists, it cannot be determined or destined. Creation too, is impossible.