Fifty Shades Darker by E.L.James

There was a lot more character development and depth in this, the second book in the series.  Christen Grey is learning that he wants more from Ana than a Dominant/Submissive relationship and is trying to figure out how this can work.  Ana is still trying to take in all of Gray and work her way down this road as well.  The relationship deepens, yet there are things that Grey is having a hard time letting go of from his past.  There was still enough erotica to keep you going, but much more substance to the story line.  I enjoyed this a lot and could not wait to get into the third one, which I am reading now!! (NOOK)