I'll try to comment, since I wrote MagicalRecord.
The actual underlying reason why your original setup didn't work is an Apple bug when fetching from a child context with sort descriptors when the parent context is not yet saved to store.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.