How realistic was the characterization? I think they were as realistic as they could be, given the topic. The characters were interesting and believable. This is definitely a good book.
What were the main relationships explored in this book? The relationship between Kai and Sienna; Kai and Daniel; Kai, Sienna and Quinn: Kai and Astrid: Sienna and Astrid.
Which did you find more appealing, the introduction or the conclusion? The conclusion was the most appealing and I look forward to reading more about Kai and Sienna.
Is the plot well-developed? It was pretty well developed and believable. The author has created a strong foundation for the story and characters which kept me turning the pages.
Disclosure: I received a review copy of this book from the author.