Bernie, Cecelia, and Roger are back at St. Opal's Academy. Their final exams and graduation are only weeks away, and the three twelve-year-olds must decide which advanced school they will attend-a choice that will shape the rest of their lives. But school visits are interrupted by a series of explosions, as two factions within Belleterre battle over the future of their secret underground world. Each has a very different vision of what that future should be.
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