I enjoyed getting to know Eva and Addie, their similarities and differences. They were more different than I would have expected since I was picturing identical twins in the same body.
It was neat though how they communicated and how they had distinct personalities as well as approaches to the challenges they were faced with.
There was lots of character development along with a plot that kept me turning the pages and anxious to know what would happen next and how they would possibly get themselves our out the next pickle.
The secondary characters were also well done. I loved the suspense of Lissa and Devon and what their motivations were and watching their relationship with Addie and Eva grow.
There was always something going on, with surprising twists and characters that I didn't expect what they did as well as help from unexpected places. I was always looking for a few extra minutes to read and always wanting just a few more pages.
I will definitely continue this series and recommend it for fans of dystopia and science fiction.
Bottom line: Great plot, characters that I felt for and amazing premise.