This book has been in my TBR pile for a long time. While I love Nalini Singh's Guild Hunter series and highley recommend them, I really wasn't sure about the Psy-Changeling series. But having read / finished this book, I can say that it's definitely a series I look forward to continuing. 
 This book takes place in a not-too-distant future where civilization is generally grouped off into Psy, Changeling, and Human. Humans are obvious of course. Changelings are what they seems as well. Bascially shifters. In Slave to Sensation we've met two packs the DarkRiver and SnowDancers, which consist of leopards and wolves respectively. I don't know if there will be others incorporated into the series or not. Psy are humans who in 1979 were "created" into what I would say are walking computers. In an effort to remove violence from everyday life, the Council created something they called Silence where people (regular humans) were drained of any and all emotions. They almost function as robots and care nothing for human contact. Psy are probably the most comple group in this world. Beyond just being emotionless humans most of them have some developmental power (telekinesis, telepathy, etc.). I think this was a predisposition in normal / regular humans before the Psy were ever created and that's why they were able to branch off from the regular human population. 
 Sascha is a Psy. But she's always felt different because she feels. She has always had some kind of feeling / emotion, but is afraid to let on that she has feelings since emotions are not highley regarded with the Psy. She's afraid they will find fault with her and decide to get rid of her. They would have not remorse or second thoughts about doing so because Psy are so pragmatic that if there is a disease you cut it out rather than let it kill the whole. So for years Sascha has been dealing with what she believes to be a mistake in her being. 
 Sascha is tasked to work with the changelings on a new housing development project. Psy, being so pragmatic, are very good at business and Sascha's family can gain a lot of money with this business venture. It is here that she meets Lucas Hunter, alpha of the DarkRiver pack. And it is here that she starts to discover that maybe having feelings isn't such a bad thing. 
 Lucas has been alpha for about ten years. He takes care of his people and when one of their own is kidnapped and brutally murdered the Changelings trace it back to a Psy. He figures by working closely with one of them on this business venture he can get information to help him and his pack find out her murdered one of their own and exact their revenge. But how do the two groups who pretty much loath each other gain the trust to learn the information needed? 
 I thought that the book was pretty good. It did have some "first in a series" moments, but nothing that would discourage me from reading more in the series. I thought all the information we received about the Psy world / mind could get a little confusion at times, so hopefully this will be something the reader gets used to as the terminology is used throughout the series. At times it almost seemed like rules were made up about the Psy world just to fit into the storyline and what was expected. 
 I thought that Nalini Singh did a really good job with the romance. This is one of those series where there will be a different hero / heroine lead in each story (same world just rotating who's up front) and at times when that's the case the romances can seem rushed because they really only have the one book to develop the characters into a relationship. Singh's pacing for the expected relationship between Sascha and Lucas is good. While they both feel an attraction to the other from the start it takes awhile for each of them to fully trust the other. 
 I thought she did a great job as well with the secondary characters, which of course is important because these characters will take their turn being the leads in the future. Singh gave enough information to get the reader interested, but left enough out as well that I can't wait to read about the next character and find out about them. 
 I'm glad I finally got around to reading this series. I would recommend this one alongside her Guild Hunters series.