I think it's a promising start to a new series. I liked Riley's character. She started out (an actually continues to be) someone who didn't want to be in the situation she ended up in, but didn't give up either because she wanted to make sure that no one else was hurt by what was going on and she wanted to make sure that she didn't get hurt anymore. 
 It's really an open end. A lot of the immediate cinflicts are taken care of but the main conflict will flow into the next book. I'm not sure if this is something that will continue for a few books and be resloved or if it's something that will continue in the background of other conflicts and then be the last resoution of the series in book nine. 
 Some reviewers were saying that this book was one big matingfest. It was, but I also thought that it's a really big part of Riley's life on a monthly basis. It's something that she has to constantly deal with. There were moments where I didn't understand her actions during the Fool Moon phase, but then again I wouldn't. I think it was important to bring this subject up in the first introduction book because it is something that is a big deal in not only Riley's life but in the life of all Weres around her in this story ujniverse. I think to bring it up anywhere but the first book would seem a bit strange. Picking up book number 3 (for example) and suddenly realizing that the moon affects Riley every month for a week to a point where it's almost debilitating for her to do anything else would seem misplaced and weird. 
 With that said. I really liked Quinn. I liked that he had an attraction to Riley (and she to him) but there were resevations on his part. I look forward to learning more about him in the books to follow. I didn't mind the end of the book when he left. Riley knew he would, she wasn't happy about it, but she was prepared. But without being an all out HEA, it was hopeful. Sometimes hope if enough to make me want to read more. 
 Rhoan was a great character in the book. He is probably the only person in the book who completely loves Riley for who / what she is. He asks to more of her than what she has. I like their twin bond. I was worried that since when the book first opened and he was already missing that we would never get to see him as a character, just talked about. I look forward to seeing him in future books as well. 
 Overall, I do think that this is a promising series. I know there are 9 books, and I have no idea what to expect from any of them as far as storyline goes, but I will definitely be finding out.