An excellent ending to an enjoyable series. Meyer's writing continues to improve, the characters have grown significantly, I didn't care much about Scarlet in her book, but she and Wolf took on larger roles in this book, and proved themselves interesting and necessary. 
 Teen fiction is something I can take or leave, but this is definitely one of the better works out there. Winter has significantly less gushy, hormonal scenes, and a lot more grit and genuine feeling than in the previous installments of the series. Obviously, Meyer wasn't going to kill off any of our four supermodel couples, but she managed to keep them in enough tension and danger that the fear was there. In the end even Iko turned out to be vitally important and likable (though I wouldn't have minded sloughing her off in Cress), if annoying. 
 I'll be interested to see what else Meyer produces in the future.