I loved how you could either read it from Syls pov 1st or violas. It really made the story a thrilling read. 

It gripped me from page 1, and I felt so much for Syl and Viola. Syl shouldn't have been treated the way she was, but she was also deceiving, and Viola seriously needs help even though I think in her mind she didn't think anything was amiss. 

Great characters, plenty of twists, and I honestly didn't see the 2 extra twists that were in them final chapters!