3.5 rounded to a 4. Even though this was a bit slow at times, I did enjoy reading this one. The first one was packed with action throughout while this one had it all in the last few chapters.
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That being said I did enjoy the exploration of Bianca's life and relationships around her so the slower parts and lack of action didn't take much away overall.
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The ending does leave it a bit open and is left to the imagination of the reader to conclude. Not necessarily a bad thing though as you can see where it's headed.