Lena and Ethan were great. More than your typical teenagers. There schoolmates, other than Linc, are all boringly and evilly typical. Amma, Uncle Macon, "The Sisters" were all great. This book has a very large cast but everyone plays their part to perfection.
It's hard for me to break it down in a quick and easy manner so I won't bother (yeah, I'm lazy like that), so I'll just say it was kinda complicated and pretty amazing.
I'm so glad I decided to listen to this. When I tried to read it it was slow goings and I could still feel that while listening but something about the narrators voice kept me listening.