This is the third installment of Casey's F.I.G. Mysteries series. They have ajusted and learned how to live and survive outside of their school, Wood Rose. In this last installment, we see the girls grow and blossom into their own. They're all already intellectual geniouses who havehad their share of challenges and hard times in their lives. We have watched them grow and navigate the challenges that were put in front of them. In this last book, Mackenzie is the highlighted girl, she is gifted in problem solving and math. She is sent on a special mission to find a particular ingredient in China that has gone missing..."easy", right? Perhaps for Mackenzie but, then there is a huge twist and she finds herself in a big mess. From there the story keeps adding twists and rollercoaster dips that kept me trying to figure out what was going on and how it was going to turn out until the last few pages! Casey did such a great job weaving this story together while keeping the reader pulled in with a piqued interest.