Although there's only a passing mention of Demonsouled people in the beginning, you won't find out about them until almost the end.  That's ok, but then the main character blindly defends someone beyond the point of inanity.  I mean I almost stopped reading because it was so mind bogglingly stupid.  Yet those are he only two issues I had with this highly entertaining book.  I haven't read the sequels yet, but I hope they're just as good if not better.