For me, A vision Of Shadows is the 6th set I've read, but for others its probably the 5th set. I read Dawn Of The Clans between Omen Of The Stars and aVoS.
I know Dawn Of The Clans ijs something you can read before you actually start reading the books, but I still count it as an actual book set. Im on A Vision Of Shadows, book 1. I've been busy reading Super Editions so I'm not caught up with all of it.
