Midnight Sins - Cynthia Eden Book #1 was a short story, so Midnight Sins was more fleshed out although not as good as the first story. Still a solid 3.5 stars to me.

Cara is a succubus who is noticed by Detective Brooks when she's a suspect in a murder. He doesn't know what she is, but is attracted to her. Although not in the usual way because he's partially psychic and she's not able to influence him as she does normal humans. They try to solve the murders and trust each other. She's been hurt a lot even though she's irresistible to men. He has to see if he can live with what she is. I'm planning on reading more of the series.