First of all, cliffhanger.
In spite of that, this book was fantastic! I could NOT put it down!
I liked Anna's character a lot. While I think she was a little too worldly for being as sheltered as she was, I still liked her attitude and her unfiltered curiosity.
X is quite the enigma. He definitely has that tough outer shell, but his soft center is hiding within where even HE can't find it. I'll tell you what, though, he's the first hero I've read in a long time that said some of those chest-aching "AWWW!" things to Anna :)
And, needless to say, HOT. I mean, my goodness. X definitely doesn't disappoint, and buying book 2 is looking mighty tempting right about now!