I read your review and it looks like we latched on to the same problems! I enjoyed the horror/thriller aspect but I did feel a little cheated in the end when I realised that a lot of the story was initially set up to misguide the reader and keep the final reveal a secret - at the expense of believability and coherence in the narrator's voice. Some of the themes were quite heavy handed too (Eva/Eve; Liberal vs Conservative take on American violence).