I have 2 questions, if Zombie taken to join the camp, why Cassie didn't? They're the same age, right? Why they want to kill Cassie instead? And what happened to kids with red light on the bus? If green means human without tracker, what is red? I hope these were explained later in book, but apparently not. Or maybe in the next book?

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Elizabeth those who were red were killed.

Cassie is 16 and the limit age was 15. I believe Zombie was 15.

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