I had a bit of trouble getting over the main characters naivety in the beginning. Or of the never questioned turn around of Lucas after the initial battle. I am normally not one to fuss on motives to much but that did bother me a bit, to have him all of a sudden be all willing to help her after being so hostile.. 
 Then another point. How does he as a old vampire all of a sudden fall in love with a 17 yo newly turned without a good explanation? I mean even twilight used Bella's 'scent' as a trigger for Edward (ok I loathe having to compare the two as they really are not alike as such) but honestly you can not tell me after being together a couple of centuries with another lady then can just all of a sudden be swapped of his feat by a girl that has no clue and got his family killed. 
 I suppose the writer may be hinting on her 'Zest of life' but even so, she is newly turned after all.. how long is that going to last? He knows all to well the jaded part that is to come with being immortal.. 
 Anyhow, If you can get over this, the story does get a lot better. The action is good, and so is the fact that our main girl gets over her initial 'I cant do it' attitude. 
 I did not see that ending coming either somehow, which surprised me.. (or the abruptness of it). This book starts a bit drb but then takes of with the speed of light. 
 Needles to say I will be awaiting the second part and hope it will redeem itself even more.