Books like Ignite, A Vampire Romance

I have been keeping up with this series for awhile now. I really, really liked this book. I loved getting to read about all the sisters (and their vampires) in one book. There was so much progress in their relationships with one another as well as with their vampires. I have been in love with Clarity and Baron since the first book, so it's wonderful to be able to keep reading about them. I knew they would do extraordinary things together. I've been continually wondering about Vayle/Derek/Zill. Even though a lot of my questions were answered in this book, I am left with many more. Which is really why I enjoy this series so much. It really keeps me going. I'm always wondering about all the characters, not only the sisters, but even Lario. He keeps finding new and amazing ways of thwarting death ... yet the sisters keep finding new and amazing ways of saving every one. There are always so many new discoveries in each book.