I still haven't found the right title, but I'm getting closer. I don't think "Be careful what you wish for" would make a good novel title, though.
I wish I could find a way to condense these words from the lyrics of "Come, Thou Fount of Every Blessing" into a stunning title:
and I hope, by thy good pleasure,
safely to arrive at home.
Did you ever have a wish turn to ashes in your mouth? What do you wish for now? Something safer?