3.5 
 After calling upon her mother, the Goddess Chaos, when her friend needed help Nyx now finds herself owing a debt to her mother (we'll just say theirs is not the most loving of mother/daughter relationships). If there's one thing Bo knows for certain, besides the fact that in some way he will have Nyx as his mate, he will not leave Nyx alone to perform this debt whatever it may end up being. So when she comes to Nyx asking her only to simply deliver a package, Bo immediately knows there's got to be more going on. Regardless, Nyx can't get out of delivering the package. If she doesn't do it, her mother has promised to deliver Nyx to her father, who wants to marry her off to another Fae for alliance purposes. 
 When they both end up getting pulled into a Hell realm, they'll have to put everything else aside if they want to get out and figure out who the intended victim of this spell was meant to be. 
 I have read Darkness Awakened so I'm at least familiar with this world. I admit I have not read books 2 and 3 in the series yet (I know I need to get on that stat!). If you're like me and you haven't read all the books, or if you haven't read any of the previous books in the series it shouldn't be a problem. I think that Katie Reus did a great job of not alienating anyone. I was able to understand who all the characters were (new and previously featured) and I enjoyed the story. I think if you are up to date on the series, all the better. The friendship between Nyx and Bo is clearly something that we see started in a previous book and I'm sure we see the developing romantic feelings being in that same book too. It is one aspect that makes me wish I had the background information. It doesn't make the reading worse for not seeing that bud of things to come, but I love the depth of emotion we get when we see things started as secondary characters and then move into the primary characters. If anything it makes me want to catch up properly on the series before any more books come out. 
 One aspect of the story that I was a little iffy on was the "mystery" surrounding who sent Nyx and Bo into the Hell realm. Honestly, it's not really even a mystery. It's very easy to figure out, yet time is spent by both Bo and Nyx and other characters trying to figure out what exactly happened. It made me wish there actually was a mystery. That we truly didn't know who / what sent Nyx and Bo into the realm. 
 Instead, this book focuses mainly on just Bo and Nyx taking their relationship from friendship to romantic and both of them struggling to come to terms with their feelings for one another. Both don't feel worthy of the other and there's a lot of miscommunication because of it. Once they are able to get on the same page, things proved to be quite hot between them, and I loved it. 
 What I've read of this book and the first book, I really love how this series takes us back to the more traditional mythologies of the various supernatural creatures featured. At least for the most part. I think with the paranormal being so popular, authors want to make their stories stand out by adding in new / different aspects to vampires, werewolves, demons, etc. Instead, I feel Katie Reus builds on an already strong foundation by focusing on the characters and relationships. I look forward to catching up and continuing on in this series. 
 *Arc provided by NetGalley in exchange for an honest review.