" A bolt from the blue. I have sometimes read of an unexpected event described in this way, and now I know exactly what is meant by the phrase.
A blue sky, a sunny, mild day. The usual list of worries and troubles runs through one's mind, but nothing that cannot be overcome, nothing that will not reach a satisfactory conclusion eventually, if not today, why then, tomorrow. An ordinary day, in fact. And then lightning strikes from out of that innocent blue sky and all that remains is the smoking ruins of one's every hope and every dream. "

― Patrice Kindl , Keeping the Castle (Keeping the Castle, #1)