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Tim returns to school, but he is behaving strangely. Discovery of the tunnel puts the Unlisted in jeopardy, and the twins have to decide whether they can trust their Bua when she accepts a job with the GCI.
Having made contact with the tunnel kids, or the Unlisted, Dru and Kal attempt to piece together what they know about the Global Child Initiative and Infinity Group. But they are interrupted by a medical emergency.
Kymara makes a mistake that places the other Unlisted in danger. The twins face increased scrutiny following a new arrival at the Sharma house, Chinese exchange student Jiao.