Well, I liked it, but I'm not quite sure what to make of that last part; it seems to have left me with more questions than answers, especially the section with the headmaster, his role in matters, and his 'Be careful' comment. But I am being perhaps too literal minded at this point...

I thought that the coda at the end of your ficmix was suitably ambiguous/menacing and made a good ending to the story as a whole. , This section also shed a lot of light on what happened in the earlier parts. I assume that the choice about leaving the 'remains of her family' behind earlier in the series was quite intentional.