Dane's next entry in her Federation series (and the beginning of the Phantom Corps). I loved how Daniel was so surprised by Carina - she was strong, but not afraid to admit when she needed/wanted help. He was sensitive, but also kickass. Interesting to have basically an assassin as your hero, but it totally works. Completely. Love the interactions of Daniel's team. I'll do a full write up of this one shortly on the blog.
I loved Relentless so much and it remains my fave, but this is a strong 2nd.