I really enjoyed the first installment of the spin-off series from Night Huntress. The two main characters in this book are Spade and Denise, one a good friend of Bones and one a good friend of Cat. The book had inclusions of Cat and Bones but it was mostly Spade and Denise's story. Denise is attacked by a demon and must find a demon she is related to in order to save herself and her family. Spade is the individual who helps her with this task throughout the book. I enjoyed the interactions between all the characters, but it wasn't quite the same as with Cat and Bones. Sure I missed them but Frost still did a great job with making the supporting characters from the others series shine in this one.