Risa Jones is in pursuit of her mother's murderer and at the same time trying to find the keys that open/close the gates of heaven and hell. In the previous books Darkness Devours one of Risa's leads is killed before she can get information from him. At the beginning of Darkness Hunts Risa decides to enter the astral plane in order to talk to his ghost to get the information. While on the astral plane she encounters a man doing violence to a woman. The man issues Risa a challenge: If she can find the woman in the real world in twenty minutes the man will spare the woman's life. Of course Risa takes the challenge, but our would-be killer doesn't play by the rules and the woman is already dead upon arrival. Risa sparks our killer's interest, however, and he decides to make her his next prey. 
 What I liked about this book the most was the fact the Keri Arthur did a great job of compartmentalizing the different storylines going on. As in her Riley Jenson series, there's a main story arc, but each book has an individual story as well. Oftentimes things would get too blurred together and it would be difficult to remember what pertained to what. Here, though, Arthur was able to make time for "the keys" storyline and then move that aside for Risa to deal with the killer. While there were only minor steps taken towards the overall story arc but this wasn't a bad this at all. There were enough significant things figured out to have an impact in the next Darkness Unmasked. 
 I have to give Keri Arthur credit for the relationship created between Risa and Azrael. The chemistry between them was building since the first book and in Darkness Devours they finally acted on those feelings. Little did they know the consequences of their actions or the fact that they would have such a big impact on them emotionally. In Darkness Hunts they are trying to keep their feelings tramped down, but it's not working so well. It was interesting to see how they dealt with it, and I was glad that it didn't become too melodramatic. Risa would love Azrael to ackknowledge his feelings, but she won't wait around for him to do so. She'll still have other lovers. 
 A very strong series Riley, Quinn, and Rhoan are featured more in this one than in previous books and I like that just fine. I can't wait until the next installment. Until Then!