Recommendation: DO NOT read if you have not read all 3 books, as this companion contains spoilers and mentions them only a few pages into this book. I was very disappointed, as I have only read Divergent and 1/2 of Insurgent. I did not read Allegiant yet, but am very disappointed to have read a plot spoiler, contained in this companion. I immediately put this down and could not read anymore, for fear of numerous spoilers. Perhaps I should have known to read all 3 books first. Just a warning to others out there who may not know! It should be specifically stated on it!
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The Divergent Companion