If you're going into this story thinking all your questions are going to be answered, you'll be disappointed. It does fill in several previously unknowns. I still don't comprehend WICKED, but I understand Thomas more. We're given more interaction with the creepy cranks and knowledge of origin of the virus. We also see what kind of people Thomas, Teresa and many others were in the beginning. This book is a little more forthcoming and clearly written than the other books, but it has that vagueness. I am aggravated some that I didn't get more; yet, I love this style of of leaving me craving more.