I found the story a bit slow going at first, and was worried I wouldn't be able to get into it, but then, as it progressed, I began to find the relationship between Lena and Alex to be very sweet and believable, and really got into the world of the story.
The ending was great. Talk about a cliffhanger!
Overall, it was a good story, and good introduction to the trilogy.
I started reading Pandemonium, straight away. I need to know what happens next!