I really enjoyed this! It was added to my reading list for originality (and the Z in my a-z challenge) - and after an even-paced start, it really took off around the middle! 
 The story read like a movie, in that it actually kept me on the edge of my seat. 
 My only complaint comes in at about a third of the way through the book - I can't pin it down, but there were just parts of the writing that felt rushed or unpolished. The writing strengthened as the story gained momentum and I became so engrossed that the single flaw lost significance. 
 I started this book on a stand-alone basis but having read it now, I will definitely be checking out the rest of the series.