I really enjoyed this first installment in the Psy-Changeling series. This world is different from the Archangels' series and slightly different from any other world I've read about and the characters are engaging. Sascha is a "defective" Psy who is sent to work with Lucas Hunter, the local alpha Changeling, on a business deal (and though she didnt' know it, to spy). Of course, there's chemistry and her ability to hide her emotions and reactions to people begins to break down. As it turns out, Sascha is Lucas' mate and they work together to find the serial killer the Psy have been hiding. 
 (view spoiler)[ I wasn't sure how she was going to make it work, but it fit nicely, it didn't seem forced when she linked to Lucas and through him to his sentinels and their mates. (hide spoiler)] 
 I hope the rest of the series follows the DarkRiver and SnowDancers packs and am interested to see how Sascha will use her new knowlesge - will she try to help others like her?