Alone
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The first line of the book caught my attention and the book proceeded to pull me in from there. I love that Sienna doesn't fully trust anyone, unlike many young adult books, where the first person the girl meets who is nice to her is the hero. I'm horrible at summaries and I hate or include too many spoilers but essentially book one of 'The Girl in the Box series is dedicated to helping the girl in the box find out who she is.
I wasn't completely wow'd by the novel, but I was pulled in enough, especially after the last line, to continue the series.