Actual Rating: 3.5 
 First Drop of Crimson is centered around Spade and Denise's romance. Spade, as we know from the Night Huntress series, is Bones' best friend while Denise is Cat's. 
 Who wouldn't like their best friend to date their spouse's best friend? It's quite a perfect match. In fact, the two couples can definitely double date all the time now. 
 The book followed a sort of generic storyline. The formula was pretty much girl asks boy to help with a task. Boy agrees but with conditions. Boy and girl pretend to be dating in order to fool everyone around them and accomplish their task. At the end of the day, they both fall in love. It's pretty simple when you break it down. However, the bonus was that this was a paranormal fiction, with the boy being a vampire and the girl (view spoiler)[turning into a shape-shifter after being blackmailed by a demon. (hide spoiler)] 
 So the plot was definitely more exciting than if it was focused on just humans. Frost developed a good chemistry with Spade and Denise. I liked the build up/development of their feelings to each other. 
 I was also intrigued by the introduction of demons and shape-shifters into the Night Huntress World. While reading The Night Huntress series with its primary characters, Cat and Bones, Frost hadn't introduced any other supernatural creatures except ghosts and ghouls. So the addition was somewhat refreshing. 
 There was a lot of insight to both Spade and Denise. They were a lot similar to each other, with the tragic ending of their past loves. I think that helped the bonding process between them. In the sense that they could definitely identify with one another. Denise's character was refreshing, definitely a break from Cat's. I liked that she wasn't completely impulsive. And she mostly did what she was told, which I guess can be attributed to the fact that she didn't have much experience in the supernatural world, as Cat did. I think that also contributed to the growth of her character, because Denise definitely started to understand how the other side lived and that's why she was able to do what was required of her at the end. So you could see the difference in her character from the beginning to the end. 
 Frost also shed some light on Ian's character. The first time I read about him in One Foot in the Grave, I was definitely interested in his character. But then when he seemed to get in the middle of Cat and Bones' relationship, I became somewhat skeptical. However, this book gave us a little insight to Ian. Although he can be annoying, a part of him that I'm beginning to love, Ian definitely seems to have more layers than what has been shown to us in the previous books. I think he's an interesting character that should be fully explored. 
 All in all, Frost delivered an entertaining book.