What was a good mystery to you about the drama “The Tempest” by William Shakespeare and why?

One mystery revolves around whether or not the brothers who are presently antagonistic toward one another will somehow legitimately reconcile. Often in the play, Prospero seems to controlling with his magic that he might not allow events to develop naturally. Yet, in spite of his magic, the events that he envisions sometimes do happen the way he hoped. I think the mystery of how the brothers will or will not reconcile is one that keeps the viewer viewing.