Archangel's Viper by Nalini Singh is book ten of the Guild Hunter series. These books work as stand-alone novels, but I suggest reading the entire series. Holly's introduction in the first book Angel's Blood starts the conflict that develops her character to the point we see her in Archangel's Viper. However, all pertinent information is summarized when relevant, so it is not necessary to read the entire series to enjoy Archangel's Viper.
Holly and Venom have interacted in several other books in the series, so their connection has unfolded over time. In Archangel's Viper, we get more of a look at Holly's capabilities caused by Uram`s attack in Angel's Blood. Holly is less angry and afraid and is able to live close to a normal life. When Viper returns from his latest mission for Raphael the two begin to realize their feelings go beyond Viper mentoring Holly to her new existence. There was hesitation in them both with seeing the other romantically, but not enough that I felt they were wasting time getting together. It was just enough to amplify the passion between the two. Holly and Viper were beautiful together and had fantastic chemistry.
Some of the Guild Hunter books are better for me than others. Although I thoroughly enjoy the Archangel Raphael, whom Viper is part of his loyal "Seven" warriors, most of the Archangels and their various plays for power in their Cadre doesn't necessarily hold my attention. I prefer those stories where that focus is less prominent. Archangel's Blade, Archangel's Shadows, and now Archangel's Viper are among my top favorites in the series, partly because of that shift.
One thing that appeals most to me in the Guild Hunter series is the strong bond the Seven have with Raphael, each other, and those connected through them. Demitri, Raphael's second and one of the most powerful vampires in Raphael's territory, rules through fear. At the same time, he fiercely protects those he loves. Demitiri does things like embrace Holly gently and kiss the top of her head, or act almost offended when Holly just assumes he would have her executed at the snap of a finger. The Seven would die for one another and Raphael without hesitation. Admiring the type of loyalty and love they feel for each other keeps me invested in their stories.
I eagerly anticipated the next installment in the Guild Hunter series. All opinions herein are my own and may not be identical to others. I urge all readers to come to their own conclusions.