Following up on the SPOILERS...
.
.
.
.
.
.
Well, in my mind the epilogue isn’t that important, the real ending is the conclusion to the case and the fact that Ava gets to make a choice using the bloody shard. Leaving it completely open was actually the first option I thought of, but I was told people would find it disappointing and I have to agree - I'm sure there would be a lot of complaints had I left it that way ;). Still, to me, the actual story ends with the fadeout on the scales.