I just read Armstrong's Personal Demon. It was a big disappointment. The ending was really great, but the majority of the book just comes off really jumbled and disjointed. The narrative switches between Lucas and Hope (half-demon who first showed up in No Humans Involved). It seems like she wanted to write a book about Lucas, but had to tie in a female lead character. Part of it comes from me having absolutely no interest in the character of Hope at all.

But the ending was great. Once it actually becomes clear what the hell was going on the story is a lot more interesting. Even with that, it is by far the worst of the series.