__Ryan and Regan Resnick, the tween children of successful scientists, have just been forced to move from their home in San Diego to the backwoods of Pennsylvania, where their parents took research positions at a company called Proact. Suffering the boredom of a small-town summer, their curiosity aroused by a surreptitious parental conversation they overhear, the Resnick kids decide to poke around their mom and dad's new jobsite one afternoon.They stumble on a secret of international importance -- an abandoned alien city buried deep beneath the Earth and filled with advanced technologies that haven't yet occurred to humankind. After cleverly making their ways past the security perimeter surrounding the secret city, Ryan and Regan are discovered by their parents and a small team of scientists tasked with exploring the city. A freak accident then gravely injures their mother, and the rest of the research crew mysteriously disappears, leaving the kids...

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