And, again in lieu of anything written by me, I commend to you
troyswann's Peregrin series. It's a fantasy AU for the TV series Lewis, but if you've never heard of the show, don't let that stop you. It stands perfectly well on its own, and contains one of the most original, fascinating, and beautiful fantasy worlds (and systems of magic) I've come across. There's also murder and (fantastic) theology and angst, which is to be expected, given the source material. (If you'd prefer it collected into a PDF, that's available here, but it's several chapters short because I haven't updated it since last year.)