This book has three strong themes: shape-shifting, a Da-Vinci-Code-secret society out to save humanity, and a journey to self-discovery theme.
This was a good book. Basically, there's a "Foundation" of shapeshifters throughout time who try to quietly save humanity, and they do so in different ways. One way is to "save" bitter, cold people, who may one day be playing important roles, by making them fall in love with someone from the Foundation who teaches them the right path/how to love again.
That's where the heroine Magdelena comes in. Her assignment this time is to "save" Julian, a powerful man who is unknowingly being groomed for an important role. She has to make him fall in love for her, and learn to love again. Of course, they fall in love, and there's another handsome shapeshifter in the picture.
Okay, it was a good book, but it wasn't for me. First of all, I like to read paranormal for the sheer magic and edginess (think Sherrilyn Kenyon or Laurell K. Hamilton). This book was really sentimental. The kind of book that's about a person's journey to self-discovery. Like the movie "Under the Tuscan Sun", which I wouldn't touch with a long stick. There was a lot of introspection, and very little action or excitement. Secondly, I'm not into the Christian overtones (secret society out to serve in the misunderstood name of biblical Magdalene). Third, I didn't like the idea of teaching men to love other women by sleeping with them then leaving them. The overlay of religious tones, public service and sexual education reminded me of the Kushiel trilogy by Jaqueline Carey, except that it didn't work for me in this modern setting book. I didn't like the idea of the heroine sleeping with these men over the last fourteen years, because someone told her to do so in the name of love/service.
So if you like journey-to-self-discovery themes like "Under the Tuscan Sun" or Nora Roberts books, or you liked books like the "Da Vinci Code" (which I haven't read, but apparently there are similar themes) or you don't mind the love-'em-and-leave-'em approach, then this one may be for you.
On the other hand, if this is a sample of what Tor's new paranormal romance line is going to be like, it's definitely better written than Harlequin's Bombshell series, which also features paranormal elements and some action.