We first meet Sin in book four, where she has a sexy liaison with the wicked and emotionless half-vampire half-werewolf Conall. Their coupling was fierce but brief. Afterward, Sin learns that she was part of a bet to see if Conall could get into her pants. However, Sin’s heart is hardened, and she has grown accustomed to being used, and using in return. For her, the act of having sex is merely a survival technique. Seminus demons need sex to live.
Sin lives with the burden of being one of kind, and is utterly alone because of it. Before her, Seminus demons have always been born Male. She is the only female in existence. In Sin Undone we learn of Sin’s past, and the turmoil she went through while going through her change into a demoness.
Eventually her unstable need for sex leads her down a dangerous path of homelessness and dark alleys. After years of slavery, and as an assassin, she rises up to the head of a group of assassins who only follow her because she wears a master ring that controls them, and she is constantly under attack by those who would take it from her. Her power—as each Seminus’s power is different—is the ability to kill through disease, but she must touch her victim to use her gift.
In the previous book Sin unwittingly unleashes a terrible disease that spreads through the werewolf community. In Sin Undone she must work with the brothers she despises, and the hated but sexy Conall to develop a cure.
Conall despises Sin for what she has done to his people but is forced to protect her in hopes of finding a cure. The fact that she needs sex every-so-often is just a bonus of the job. Or is it more than that? Conall’s cold demeanor slowly softens toward Sin as he learns she’s not the cold heartless bitch she tries to portray.
After being separated from her brothers and fending off multiple assassination attempts by everyone but the kitchen sink, while repeatedly having mind-blowing sex with Conall, Sin struggles with her guilt, her past, and her unwanted feelings for Conall—the whole while trying to protect her heart from more damage.
I enjoyed this story from the start. Sin’s need to close off her emotions only to have them forced out of her by Conall was both heart wrenching and endearing. I didn’t like Conall at first, because he was a jerk to Sin, then again Sin was a Jerk to everyone, but I quickly changed my mind about him when he started realizing his feelings for Sin.
There is a part where Sin gets a little freaky with a snowball that I sort of blocked out though. O_o