Maybe 3 1/2 stars. I had some trouble getting back into this series. This second book starts up immediately where the first left off and, since some time had passed since I'd read the first, I stumbled over who was who and what was going on a little bit. Reads quickly, decent pacing. Kind of obvious, the stuff you're not supposed to know yet but that's being hinted at. 
 The triangle between Clary, Simon and Jace gets a little more complicated, but resolves a bit by the end of the book, to no one's satisfaction. Clary finds a little more truth about her family. Jace doesn't, but seems to figure out where he belongs, anyway. They both learn more about their own abilities, however. Well set up for the next book.