When Sydney Monaco's twin, Noah, goes radio silent, her private-eye instincts slide into gear. The search uncovers a hidden chamber, an ancient artifact, and a decade-old crime, thrusting the twins down a rabbit-hole of mayhem, medical mystery, and murder.

To solve the case, characters from other volumes of this high-tech series come in to lend a hand. In order to get answers before the villains catch up to them, the twins must use cutting-edge technology to unravel the mysteries before the murderers strike again.

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