It's a good book if you're still a kid at heart. The writing style was mildly childish and a little too 'I'm a bad ass and I'm gonna say I'm a bad ass even though I don't need to declare it.' If I didn't know better I would say it was written by an inexperienced author who was trying to rush the story.
As far as plot line goes, it's not the first but certainly takes a new twist on non-human characters. As I have never read the Girl in the Box series I have no way of knowing if this story is similar in writing style to its predecessor, but after reading this story I have no intention of continuing the series or going back to the original series.
Sienna Nealon is a one dimensional character construed from the mind of a writer who likes to put as little animation into a character as possible. When using a character from a different series a writer must put a new exposition into the new series else a reader who is jumping in gets confused. The entire first quarter of the story, the part where the main exposition should lie, is filled with nothing but flaunting the "limitless" abilities of the character who seems to be able to do whatever she wants. This makes it very difficult to relate to Sienna because she is so limitless. Most readers connect with a character by their flaws or their hobbies. Since very few people in this world are meta human detectives who can turn into dragons, this leaves very few areas of connection to be made. Perhaps her only limited ability is her own arrogant attitude which is, least to say, painted all over the novel. As far as character development, Robert Crane has failed in evolving the most important character in his story-the protagonist.
Imaginative and stultifying, it would be best to remain in the teen section rather than the adult section I found it in at my local library. For its lack of compelling use of writing style, failure to draw in this reader, and failed character development I must rate this story 2 stars.