I was going through Hjerim when my game froze. I already had Butcher Journal 1 and the Strange Amulet, but when I rebooted the game, the Amulet had disappeared from my inventory, and I couldn't collect it from the bookshelf again. Any help?
Blood on the Ice is one of the most buggy quests in the game. Although I haven't heard of that particular issue before, I believe it can still be remedied. You could try to progress with the quest, although that's unlikely to occur, so the best bet is to do as the two users above me have suggested.