I have Night Unbound to read from Kensington, but it's about Lisette and she just didn't have enough page time up until now for me to get to know her. I'm a little worried about it. However, I love this series and have since I read Darkness Dawns in early 2012.
I read Night Unbound, and it was my least fav installment to date, because yes, Duvall didn't develop her character enough IMO. The series' main story arc took over the book, and the chemitry between her and Zach just wasn't believable. :(