Hogwarts through the eyes of many of the characters as Harry loses his mind, Draco becomes bitter, Luna gleefully stalks everyone, and Ron and Hermione wonder what's going on.
Wow, this story! It's really powerful, and original, and brilliantly told (I'd have lots of highlights if I'd read it as an actual ebook, not online, both in the dialogue and in the musings) but it's a little too dark for me to round up. The years-passing epilogue, after the climactic was-it-a-victory battle, offers hope, but shadows linger, bitter and bittersweet.
It's slow-burn Draco/Harry, but more than that, more than anything rosy or sweet or sexy (despite some very funny passages — more in the earlier chapters than later — and many very touching ones about trying to protect and care for the one[s] you care about, even if the relationships don't follow any conventional logic), it's about Harry as a victim of the prophecy, a victim turned dangerous weapon, dangerous not necessarily only to the Death Eater side.
Not-a-Death-Eater-but-no-Muggle-lover Draco and not-an-idiot-but-definitely-with-her-own-quirks Luna are the other main PoVs, both brilliantly drawn, in a narrative partly epistolary, partly journaling (Oh, Luna!), and partly standard third-person-limited, but there are a number of others (canonical Hogwarts cast), too.
Some are involved in trying to manipulate Harry, a number are outsider-PoVs bewilderedly trying to figure out what's going on, some become collateral damage, or take action in their own right. A few scenes are directly retold from a second perspective, but once you realize where in the narrative you are again, it's always worthwhile. Each section is headed with the name identifying whose PoV, and the sometimes-approximate date.
Ron actually comes off a little better than Hermione for a change, in terms of getting a clue, though he doesn't make a stellar showing in dealing with what he learns, and neither is let in on Harry's secrets.
I don't want to get either even more long-winded or spoiler-y, so I think I'll avoid trying to say more about the plot. The editing is good, and Oh! I swore to remember to mention that about half of the chapter-heading epigraphs are from Lois McMaster Bujold, my maybe-favorite author.